Xamarin Android App Using SQLite and Custom ListView






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This tutorial will explain how to develop android app with Xamarin tool provided by visual studio. This post will walk you through creating a small android app related to AddressBook.
Introduction
-
How to create android project in visual studio and setting up JDK and Android SDK location in visual studio IDE. How to create style and apply it on our layout components
-
How to create SQLite database and perform CRUD operation
-
How to create custom ListView and some operation with it
-
How to pass values between activities using intents
Snapshot 2: Form to add new contact or edit existing contact
Snapshot 3: Delete contact
Before creating your first app, firstly you just need to make sure that Android Setting of your Xamarin is correct or not. You can check it from Tools->Options->Xamarin->Android Setting on Microsoft Visual Studio start page. Moreover, you can change the location of JDK and Android SDK if necessary.
SQLite Database for Address book
-
GetAllContacts(): Retrive all contacts available in the database.
-
GetContactsBySearchName(string nameToSearch): Read contacts according to passed search parameter nameToSearch.
-
AddNewContact(AddressBook contactinfo): Insert new contact information.
-
UpdateContact(AddressBook contitem): Update existing contact based on Id property of the class AddressBook.
-
DeleteContact(string contactId): Delete existing contact according to contact Id.
public class AddressBookDbHelper: SQLiteOpenHelper
{
private const string APP_DATABASENAME = "Student.db3";
private const int APP_DATABASE_VERSION = 1;
public AddressBookDbHelper(Context ctx):
base(ctx, APP_DATABASENAME, null, APP_DATABASE_VERSION)
{
}
public override void OnCreate(SQLiteDatabase db)
{
db.ExecSQL(@"CREATE TABLE IF NOT EXISTS AddressBook(
Id INTEGER PRIMARY KEY AUTOINCREMENT,
FullName TEXT NOT NULL,
Mobile TEXT NOT NULL,
Email TEXT NULL,
Details TEXT)");
db.ExecSQL("Insert into AddressBook(FullName,Mobile,Email,Details)VALUES('Sharad Chandra Pyakurel','9851162459','sharad.pyakurel@gmail.com','this is details')");
db.ExecSQL("Insert into AddressBook(FullName,Mobile,Email,Details)VALUES('Gopal Prasad','9841258963','gopal.pyakurel@gmail.com','this is details')");
}
public override void OnUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
db.ExecSQL("DROP TABLE IF EXISTS AddressBook");
OnCreate(db);
}
//Retrive All Contact Details
public IList<AddressBook> GetAllContacts()
{
SQLiteDatabase db = this.ReadableDatabase;
ICursor c = db.Query("AddressBook", new string[] { "Id", "FullName", "Mobile", "Email", "Details" }, null, null, null, null, null);
var contacts = new List<AddressBook>();
while (c.MoveToNext())
{
contacts.Add(new AddressBook
{
Id = c.GetInt(0),
FullName = c.GetString(1),
Mobile = c.GetString(2),
Email = c.GetString(3),
Details = c.GetString(4) });
}
c.Close();
db.Close();
return contacts;
}
//Retrive All Contact Details
public IList<AddressBook> GetContactsBySearchName(string nameToSearch)
{
SQLiteDatabase db = this.ReadableDatabase;
ICursor c = db.Query("AddressBook", new string[] { "Id", "FullName", "Mobile", "Email", "Details" }, "upper(FullName) LIKE ?", new string[] {"%"+ nameToSearch.ToUpper() +"%"}, null, null, null, null);
var contacts = new List<AddressBook>();
while (c.MoveToNext())
{
contacts.Add(new AddressBook
{
Id = c.GetInt(0),
FullName = c.GetString(1),
Mobile = c.GetString(2),
Email = c.GetString(3),
Details = c.GetString(4)
});
}
c.Close();
db.Close();
return contacts;
}
//Add New Contact
public void AddNewContact(AddressBook contactinfo)
{
SQLiteDatabase db = this.WritableDatabase;
ContentValues vals = new ContentValues();
vals.Put("FullName", contactinfo.FullName);
vals.Put("Mobile", contactinfo.Mobile);
vals.Put("Email", contactinfo.Email);
vals.Put("Details", contactinfo.Details);
db.Insert("AddressBook", null, vals);
}
//Get contact details by contact Id
public ICursor getContactById(int id)
{
SQLiteDatabase db = this.ReadableDatabase;
ICursor res = db.RawQuery("select * from AddressBook where Id=" + id + "", null);
return res;
}
//Update Existing contact
public void UpdateContact(AddressBook contitem)
{
if (contitem == null)
{
return;
}
//Obtain writable database
SQLiteDatabase db = this.WritableDatabase;
//Prepare content values
ContentValues vals = new ContentValues();
vals.Put("FullName", contitem.FullName);
vals.Put("Mobile", contitem.Mobile);
vals.Put("Email", contitem.Email);
vals.Put("Details", contitem.Details);
ICursor cursor = db.Query("AddressBook",
new String[] {"Id", "FullName", "Mobile", "Email", "Details" }, "Id=?", new string[] { contitem.Id.ToString() }, null, null, null, null);
if (cursor != null)
{
if (cursor.MoveToFirst())
{
// update the row
db.Update("AddressBook", vals, "Id=?", new String[] { cursor.GetString(0) });
}
cursor.Close();
}
}
//Delete Existing contact
public void DeleteContact(string contactId)
{
if (contactId == null)
{
return;
}
//Obtain writable database
SQLiteDatabase db = this.WritableDatabase;
ICursor cursor = db.Query("AddressBook",
new String[] { "Id", "FullName", "Mobile", "Email", "Details" }, "Id=?", new string[] { contactId }, null, null, null, null);
if (cursor != null)
{
if (cursor.MoveToFirst())
{
// update the row
db.Delete("AddressBook", "Id=?", new String[] { cursor.GetString(0) });
}
cursor.Close();
}
}
}
The class AddressBook contains following properties which is matched with the columns in the table AddressBook
public class AddressBook
{
public int Id { get; set; }
public string FullName { get; set; }
public string Mobile { get; set; }
public string Email { get; set; }
public string Details { get; set; }
public static explicit operator AddressBook(Java.Lang.Object v)
{
throw new NotImplementedException();
}
}
Creating ListView and custom base adapter for ListView
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="beforeDescendants"
android:focusableInTouchMode="true"
android:paddingBottom="1dp"
android:paddingLeft="1dp"
android:paddingRight="1dp"
android:paddingTop="0dp">
<TableLayout
android:id="@+id/tableLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TableRow>
<Button
android:id="@+id/contactList_btnAdd"
style="@style/button_style"
android:layout_weight="1"
android:text="Add New Contact" />
</TableRow>
<TableRow>
<EditText
android:id="@+id/contactList_txtSearch"
style="@style/input_style"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="Search" />
<Button
android:id="@+id/contactList_btnSearch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#0f87ff"
android:layout_marginRight="1dp"
android:paddingTop="9dp"
android:paddingBottom="9dp"
android:text="Search"
android:textAlignment="center"
android:textAllCaps="false"
android:minHeight="0dp"
android:textColor="#fff"
android:textSize="15sp" />
</TableRow>
</TableLayout>
<ListView
android:id="@+id/contactList_listView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/tableLayout"
android:layout_marginTop="0dp"
android:layout_weight="1"
android:clickable="true"
android:divider="#b5b5b5"
android:dividerHeight="1dp"
android:listSelector="@drawable/list_selector" />
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/list_selector"
android:orientation="vertical"
android:padding="2dp">
<TableLayout
android:layout_width="fill_parent"
android:padding="3dp"
android:layout_height="wrap_content">
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="2dp"
android:text="Name: "
android:textColor="#000" />
<TextView
android:id="@+id/lr_fullName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:text="Full Name"
android:textColor="#0000dd"
android:textSize="15dp"
android:textStyle="bold" />
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="2dp"
android:text="Mobile: "
android:textColor="#000" />
<TextView
android:id="@+id/lr_mobile"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:text="Mobile"
android:textColor="#0000dd"
android:textSize="15dip"
android:textStyle="bold" />
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="2dp"
android:text="Email: "
android:textColor="#000" />
<TextView
android:id="@+id/lr_email"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:text="Email"
android:textColor="#0000dd"
android:textSize="15dp" />
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="2dp"
android:text="Description: "
android:textColor="#000" />
<TextView
android:id="@+id/lr_descriptin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:text="description"
android:textColor="#0000dd"
android:textSize="15dp" />
</TableRow>
</TableLayout>
<ImageView
android:id="@+id/lr_deleteBtn"
android:layout_width="50dip"
android:layout_height="100dip"
android:src="@drawable/delete"
android:layout_alignParentRight="true"
android:clickable="true"
/>
</RelativeLayout>
[Activity(Label = "ContactListBaseAdapter")]
public partial class ContactListBaseAdapter : BaseAdapter<AddressBook>
{
IList<AddressBook> contactListArrayList;
private LayoutInflater mInflater;
private Context activity;
public ContactListBaseAdapter(Context context,
IList<AddressBook> results)
{
this.activity = context;
contactListArrayList = results;
mInflater = (LayoutInflater)activity.GetSystemService(Context.LayoutInflaterService);
}
public override int Count
{
get { return contactListArrayList.Count; }
}
public override long GetItemId(int position)
{
return position;
}
public override AddressBook this[int position]
{
get { return contactListArrayList[position]; }
}
public override View GetView(int position, View convertView, ViewGroup parent)
{
ImageView btnDelete;
ContactsViewHolder holder = null;
if (convertView == null)
{
convertView = mInflater.Inflate(Resource.Layout.list_row_contact_list, null);
holder = new ContactsViewHolder();
holder.txtFullName = convertView.FindViewById<TextView>(Resource.Id.lr_fullName);
holder.txtMobile = convertView.FindViewById<TextView>(Resource.Id.lr_mobile);
holder.txtEmail = convertView.FindViewById<TextView>(Resource.Id.lr_email);
holder.txtDescription = convertView.FindViewById<TextView>(Resource.Id.lr_descriptin);
btnDelete = convertView.FindViewById<ImageView>(Resource.Id.lr_deleteBtn);
btnDelete.Click += (object sender, EventArgs e) =>
{
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
AlertDialog confirm = builder.Create();
confirm.SetTitle("Confirm Delete");
confirm.SetMessage("Are you sure delete?");
confirm.SetButton("OK", (s, ev) =>
{
var poldel = (int)((sender as ImageView).Tag);
string id = contactListArrayList[poldel].Id.ToString();
string fname = contactListArrayList[poldel].FullName;
contactListArrayList.RemoveAt(poldel);
DeleteSelectedContact(id);
NotifyDataSetChanged();
Toast.MakeText(activity, "Contact Deeletd Successfully", ToastLength.Short).Show();
});
confirm.SetButton2("Cancel", (s, ev) =>
{
});
confirm.Show();
};
convertView.Tag = holder;
btnDelete.Tag = position;
}
else
{
btnDelete = convertView.FindViewById<ImageView>(Resource.Id.lr_deleteBtn);
holder = convertView.Tag as ContactsViewHolder;
btnDelete.Tag = position;
}
holder.txtFullName.Text = contactListArrayList[position].FullName.ToString();
holder.txtMobile.Text = contactListArrayList[position].Mobile;
holder.txtEmail.Text = contactListArrayList[position].Email;
holder.txtDescription.Text = contactListArrayList[position].Details;
if (position % 2 == 0)
{
convertView.SetBackgroundResource(Resource.Drawable.list_selector);
}
else
{
convertView.SetBackgroundResource(Resource.Drawable.list_selector_alternate);
}
return convertView;
}
public IList<AddressBook> GetAllData()
{
return contactListArrayList;
}
public class ContactsViewHolder : Java.Lang.Object
{
public TextView txtFullName { get; set; }
public TextView txtMobile { get; set; }
public TextView txtEmail { get; set; }
public TextView txtDescription { get; set; }
}
private void DeleteSelectedContact(string contactId)
{
AddressBookDbHelper _db = new AddressBookDbHelper(activity);
_db.DeleteContact(contactId);
}
}
Setting custom Adapter to ListView
Once our custom adapter is ready, we need to instantiate this adapter to set to ListView.
[Activity(Label = "Contact List", MainLauncher = true, Icon = "@drawable/icon")]
public class MainActivity : Activity
{
Button btnAdd, btnSearch;
EditText txtSearch;
ListView lv;
IList<AddressBook> listItsms = null;
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
btnAdd = FindViewById<Button>(Resource.Id.contactList_btnAdd);
btnSearch = FindViewById<Button>(Resource.Id.contactList_btnSearch);
txtSearch = FindViewById<EditText>(Resource.Id.contactList_txtSearch);
lv = FindViewById<ListView>(Resource.Id.contactList_listView);
btnAdd.Click += delegate
{
var activityAddEdit = new Intent(this, typeof(AddEditAddressBookActivity));
StartActivity(activityAddEdit);
};
btnSearch.Click += delegate
{
LoadContactsInList();
};
LoadContactsInList();
}
private void LoadContactsInList()
{
AddressBookDbHelper dbVals = new AddressBookDbHelper(this);
if (txtSearch.Text.Trim().Length < 1)
{
listItsms = dbVals.GetAllContacts();
}
else {
listItsms = dbVals.GetContactsBySearchName(txtSearch.Text.Trim());
}
lv.Adapter = new ContactListBaseAdapter(this, listItsms);
lv.ItemLongClick += lv_ItemLongClick;
}
private void lv_ItemLongClick(object sender, AdapterView.ItemLongClickEventArgs e)
{
AddressBook o = listItsms[e.Position];
var activityAddEdit = new Intent(this, typeof(AddEditAddressBookActivity));
activityAddEdit.PutExtra("ContactId", o.Id.ToString());
activityAddEdit.PutExtra("ContactName", o.FullName);
StartActivity(activityAddEdit);
}
}
We have created lv_ItemLongClick call back to handle ListView long press event. The selected contact will open in new window for edit with existing information filled in when we long press the item in ListView. The value indicating edit mode is passed using intent PutExtra method.
Add Or Edit contacts
The design layout related to adding new contact or editing existing contact is written in the following code block. The design view of this layout is shown just below the following code block.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:scrollbars="none">
<TableLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Contact Id " />
<EditText
android:id="@+id/addEdit_ContactId"
style="@style/input_style"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:editable="false"
android:hint="Contact Id" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Full Name " />
<EditText
android:id="@+id/addEdit_FullName"
style="@style/input_style"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/addEdit_ContactId"
android:layout_weight="1"
android:hint="Full Name" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Mobile" />
<EditText
android:id="@+id/addEdit_Mobile"
style="@style/input_style"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/addEdit_FullName"
android:layout_weight="1"
android:hint="Mobile" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Email" />
<EditText
android:id="@+id/addEdit_Email"
style="@style/input_style"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/addEdit_Mobile"
android:layout_weight="1"
android:hint="Email" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Description" />
<EditText
android:id="@+id/addEdit_Description"
style="@style/input_style"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/addEdit_Email"
android:layout_weight="1"
android:gravity="top|left"
android:hint="Description"
android:inputType="textMultiLine"
android:lines="4"
android:scrollHorizontally="false"
android:scrollbars="vertical" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" " />
<Button
android:id="@+id/addEdit_btnSave"
style="@style/button_style"
android:layout_weight="1"
android:text=" Save " />
</TableRow>
</TableLayout>
</ScrollView>
</RelativeLayout>
It is often good idea to apply some visual style to various controls such as EditText, Button, or even the whole form. Generally some basic style can be applied using resource xml or image file that we have added in drawable. But we can create our separate style file mentioning appropriate styles such as size, color, margin, background, and etc in the form of a xml file. The xml code for style.xml which is used to apply style to controls is following:
<resources>
<style name="input_style">
<item name="android:background">@drawable/input_shape</item>
<item name="android:layout_marginTop">1dp</item>
<item name="android:layout_marginRight">10dp</item>
<item name="android:layout_marginBottom">7dp</item>
<item name="android:paddingLeft">8dp</item>
<item name="android:paddingTop">9dp</item>
<item name="android:paddingBottom">9dp</item>
<item name="android:textSize">16sp</item>
<item name="android:textColor">#000</item>
</style>
<style name="button_style">
<item name="android:background">@drawable/button_shape</item>
<item name="android:layout_width">match_parent</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:layout_margin">1dp</item>
<item name="android:paddingLeft">5dp</item>
<item name="android:paddingRight">5dp</item>
<item name="android:paddingTop">9dp</item>
<item name="android:paddingBottom">9dp</item>
<item name="android:textSize">16sp</item>
<item name="android:textColor">#fff</item>
<item name="android:textAllCaps">false</item>
<item name="android:minHeight">35dp</item>
</style>
</resources>
The value received by Intent.GetStringExtra("ContactId") ?? string.Empty will determine the save mode of the contact. If we get positive Intent.GetStringExtra value then existing contact information of the particular Id will be loaded by LoadDataForEdit(string contactId) method thereby indicating edit mode. If the value is empty the activity will open in new entry mode.
[Activity(Label = "Add/Edit Contacts")]
public class AddEditAddressBookActivity : Activity
{
EditText txtId, txtFullName, txtMobile, txtEmail, txtDescription;
Button btnSave;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.AddEditContacts);
txtId = FindViewById<EditText>(Resource.Id.addEdit_ContactId);
txtFullName = FindViewById<EditText>(Resource.Id.addEdit_FullName);
txtMobile = FindViewById<EditText>(Resource.Id.addEdit_Mobile);
txtEmail = FindViewById<EditText>(Resource.Id.addEdit_Email);
txtDescription = FindViewById<EditText>(Resource.Id.addEdit_Description);
btnSave = FindViewById<Button>(Resource.Id.addEdit_btnSave);
btnSave.Click += buttonSave_Click;
string editId = Intent.GetStringExtra("ContactId") ?? string.Empty;
if (editId.Trim().Length > 0)
{
txtId.Text = editId;
LoadDataForEdit(editId);
}
}
private void LoadDataForEdit(string contactId)
{
AddressBookDbHelper db = new AddressBookDbHelper(this);
ICursor cData = db.getContactById(int.Parse(contactId));
if (cData.MoveToFirst())
{
txtFullName.Text = cData.GetString(cData.GetColumnIndex("FullName"));
txtMobile.Text = cData.GetString(cData.GetColumnIndex("Mobile"));
txtEmail.Text = cData.GetString(cData.GetColumnIndex("Email"));
txtDescription.Text = cData.GetString(cData.GetColumnIndex("Details"));
}
}
void buttonSave_Click(object sender, EventArgs e)
{
AddressBookDbHelper db = new AddressBookDbHelper(this);
if (txtFullName.Text.Trim().Length < 1)
{
Toast.MakeText(this, "Enter Full Name.", ToastLength.Short).Show();
return;
}
if (txtMobile.Text.Trim().Length < 1)
{
Toast.MakeText(this, "Enter Mobile Number.", ToastLength.Short).Show();
return;
}
if (txtEmail.Text.Trim().Length > 0)
{
string EmailPattern = @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*";
if (!Regex.IsMatch(txtEmail.Text, EmailPattern, RegexOptions.IgnoreCase))
{
Toast.MakeText(this, "Invalid email address.", ToastLength.Short).Show();
return;
}
}
AddressBook ab = new AddressBook();
if (txtId.Text.Trim().Length > 0)
{
ab.Id = int.Parse(txtId.Text);
}
ab.FullName = txtFullName.Text;
ab.Mobile = txtMobile.Text;
ab.Email = txtEmail.Text;
ab.Details = txtDescription.Text;
try
{
if (txtId.Text.Trim().Length > 0)
{
db.UpdateContact(ab);
Toast.MakeText(this, "Contact Updated Successfully.", ToastLength.Short).Show();
}
else
{
db.AddNewContact(ab);
Toast.MakeText(this, "New Contact Created Successfully.", ToastLength.Short).Show();
}
Finish();
//Go to main activity after save/edit
var mainActivity = new Intent(this, typeof(MainActivity));
StartActivity(mainActivity);
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
}
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