Hi my name is vishal i was wondering on how to pass value of variable from login form to another form which inserts that value into another table in c# windows forms with sql server 2008?
So i am developing a application named:
Mini Project,i also have a login form named:
frmLogin. Given below is
c# code of my login form(
frmLogin):
namespace Mini_Project
{
public partial class frmLogin : Form
{
public int mid;
public int uid = 0;
public frmLogin()
{
InitializeComponent();
}
private void frmLogin_Load(object sender, EventArgs e)
{
}
private bool ManagerUser(string username, string password)
{
bool success = false;
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd = new SqlCommand("Select manager_id,manager_first_name from [dbo].[ManagerDetail2] where username='"+txtUsername.Text+"' and password='"+txtPassword.Text+"' and LoginAttempts< 3", conn);
SqlDataReader rd = cmd.ExecuteReader();
while(rd.Read())
{
success=true;
}
rd.Close();
conn.Close();
return success;
}
private bool ValidateUser(string username, string password)
{
bool success = false;
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd = new SqlCommand("Select * from [dbo].[UserDetail2] where username='"+txtUsername.Text+"' and password='"+txtPassword.Text+"' and LoginAttempts< 3", conn);
SqlDataReader rd = cmd.ExecuteReader();
while(rd.Read())
{
success=true;
}
rd.Close();
conn.Close();
return success;
}
private void btnLogin_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
if ((txtPassword.Text == "password") && (txtUsername.Text.ToLower() == "admin"))
{
Module.Instance.Admin = 1;
MDIParent1 h = new MDIParent1();
h.Show();
this.Close();
}
else
{
string username = txtUsername.Text;
string password = txtPassword.Text;
bool validUser = ValidateUser(username, password);
bool validmanager = ManagerUser(username, password);
if (validUser)
{
uid = 0;
string name = ("Select user_first_name,user_last_name,user_id from [dbo].[UserDetail2] where username='" + txtUsername.Text + "'");
cmd = new SqlCommand(name);
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
name = dr[0].ToString() + " " + dr[1].ToString()+System.Environment.NewLine+dr[2].ToString();
uid = Convert.ToInt32(dr[2].ToString());
}
dr.Close();
cmd = new SqlCommand("Update [dbo].[UserDetail2] set LoginAttempts=0 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
frmUser u = new frmUser();
Module.Instance.User =u.autoGenId;
MDIParent1 m = new MDIParent1();
m.Show();
this.Close();
}
if (validmanager)
{
string manager = ("Select manager_first_name,manager_last_name,manager_id from [dbo].[ManagerDetail2] where username='" + txtUsername.Text + "'");
cmd = new SqlCommand(manager);
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
SqlDataReader fr = cmd.ExecuteReader();
while (fr.Read())
{
manager = fr[0].ToString() + " " + fr[1].ToString()+System.Environment.NewLine+fr[2].ToString();
mid = Convert.ToInt32(fr[2].ToString());
}
fr.Close();
cmd = new SqlCommand("Update [dbo].[ManagerDetail2] set LoginAttempts=0 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
frmManager y=new frmManager();
Module.Instance.Manager =y.bGenId;
MDIParent1 g = new MDIParent1();
g.Show();
this.Close();
}
else
{
cmd = new SqlCommand("Update [dbo].[UserDetail2] set LoginAttempts=LoginAttempts+1 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
cmd = new SqlCommand("Update [dbo].[ManagerDetail2] set LoginAttempts=LoginAttempts+1 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
MessageBox.Show("Invalid user name or password. Please try tomorow ", "Task", MessageBoxButtons.OK, MessageBoxIcon.Warning);
txtUsername.Focus();
}
}
}
private void btnCancel_Click(object sender, EventArgs e)
{
Application.Exit();
}
The above code works Fine to some extent! As you can see i login/enter into application using default username:
admin and default password:
password as a
admin,create a manager for tasks. Given below is c# code of form(
frmManager) through which i create manager for tasks,insert values into table:
ManagerDetail2 in sql server2008!:
namespace Mini_Project
{
public partial class frmManager : Form
{
public int bGenId = -1;
public frmManager()
{
InitializeComponent();
}
private void btnCreate_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd = new SqlCommand("Insert into [dbo].[ManagerDetail2](manager_first_name,manager_last_name,manager_dob,manager_sex,email,username,password,status,created_by,LoginAttempts,row_upd_date)" + "Values(@manager_first_name,@manager_last_name,@manager_dob,@manager_sex,@email,@username,@password,@status,@created_by,@LoginAttempts,GetDate()); Select @autoGenId=SCOPE_IDENTITY();", conn);
cmd.Parameters.AddWithValue("@manager_first_name", txtFName.Text);
cmd.Parameters.AddWithValue("@manager_last_name", txtLName.Text);
cmd.Parameters.AddWithValue("@manager_dob", dtDOB.Value);
if (cboSex.SelectedIndex == 0)
{
cmd.Parameters.AddWithValue("@manager_sex", "Male");
}
else if (cboSex.SelectedIndex == 1)
{
cmd.Parameters.AddWithValue("@manager_sex", "Female");
}
else if (cboSex.SelectedIndex == 2)
{
cmd.Parameters.AddWithValue("@manager_sex", "Transgender");
}
cmd.Parameters.AddWithValue("@email", txtEmailID.Text);
cmd.Parameters.AddWithValue("@username", txtUsername.Text);
cmd.Parameters.AddWithValue("@password", txtPassword.Text);
cmd.Parameters.AddWithValue("@status", 1);
cmd.Parameters.AddWithValue("@Created_by", 1);
cmd.Parameters.AddWithValue("@LoginAttempts", 0);
cmd.Parameters.Add("@autoGenId", SqlDbType.Int).Direction = ParameterDirection.Output;
cmd.ExecuteNonQuery();
bGenId = Convert.ToInt32(cmd.Parameters["@autoGenId"].Value);
cmd = new SqlCommand("Update [dbo].[ManagerDetail2] set LoginAttempts=0 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
MessageBox.Show("Manager Detail was added successfully", "Task", MessageBoxButtons.OK, MessageBoxIcon.Information);
conn.Close();
this.Close();
}
The above code works fine with no problem at all!
Given below is structure of table:
ManagerDetail2 in sql server 2008:
ColumnName DataType AllowNulls
manager_id(auto-increment primary key) Int No
manager_first_name nvarchar(50) Yes
manager_last_name nvarchar(50) Yes
manager_dob date Yes
manager_sex nvarchar(20) Yes
email nvarchar(60) Yes
username nvarchar(25) Yes
password nvarchar(15) Yes
status bit Yes
created_by Int Yes
LoginAttempts Int Yes
row_upd_date datetime Yes
So using
username and
password from table:
ManagerDetail2 i enter/login into application as
manager(each manager has different manager_id as field:manager_id in table:ManagerDetail2 is auto-increment primary key),create/add new users to application who will come under me/that particular manager only!
As you can see in my below c# code of login form(
frmLogin) of how i get manager first name,manager last name and manager_id of currently logged in manager of application.Given below is that c# code:
namespace Mini_Project
{
public partial class frmLogin : Form
{
public int mid;
public frmLogin()
{
InitializeComponent();
}
private bool ManagerUser(string username, string password)
{
bool success = false;
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd = new SqlCommand("Select manager_id,manager_first_name from [dbo].[ManagerDetail2] where username='"+txtUsername.Text+"' and password='"+txtPassword.Text+"' and LoginAttempts< 3", conn);
SqlDataReader rd = cmd.ExecuteReader();
while(rd.Read())
{
success=true;
}rd.Close();
conn.Close();
return success;
}
private void btnLogin_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
string username = txtUsername.Text;
string password = txtPassword.Text;
bool validmanager = ManagerUser(username, password);
if (validmanager)
{
string manager = ("Select manager_first_name,manager_last_name,manager_id from [dbo].[ManagerDetail2] where username='" + txtUsername.Text + "'");
cmd = new SqlCommand(manager);
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
SqlDataReader fr = cmd.ExecuteReader();
while (fr.Read())
{
manager = fr[0].ToString() + " " + fr[1].ToString()+System.Environment.NewLine+fr[2].ToString();
mid = Convert.ToInt32(fr[2].ToString());
}
fr.Close();
cmd = new SqlCommand("Update [dbo].[ManagerDetail2] set LoginAttempts=0 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
MDIParent1 g = new MDIParent1();
g.Show();
this.Close();
}
As you can see variable
mid of data type:
Int contains value of
manager_id of currently logged in manager of application!
So i enter/login into application as a manager,create new users to application who will come under me/that particular manager only.Given below is c# code of form(
frmUser) through which i create new users to application,also insert values into table:
UserDetail2:
namespace Mini_Project
{
public partial class frmUser : Form
{
public int autoGenId = -1;
public frmUser()
{
InitializeComponent();
frmLogin j = new frmLogin();
Int man = j.mid;
}
private void btnCreate_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd = new SqlCommand("Insert into [dbo].[UserDetail2](user_first_name,user_last_name,user_dob,user_sex,email,username,password,status,row_upd_date,created_by,LoginAttempts)" + "Values(@user_first_name,@user_last_name,@user_dob,@user_sex,@email,@username,@password,@status,GetDate(),@created_by,@LoginAttempts); Select @autoGenId=SCOPE_IDENTITY();", conn);
cmd.Parameters.AddWithValue("@user_first_name", txtFName.Text);
cmd.Parameters.AddWithValue("@user_last_name", txtLName.Text);
cmd.Parameters.AddWithValue("@user_dob", dtDOB.Value);
if (cboSex.SelectedIndex == 0)
{
cmd.Parameters.AddWithValue("@user_sex", "Male");
}
else if (cboSex.SelectedIndex == 1)
{
cmd.Parameters.AddWithValue("@user_sex", "Female");
}
else if (cboSex.SelectedIndex == 2)
{
cmd.Parameters.AddWithValue("@user_sex", "Transgender");
}
cmd.Parameters.AddWithValue("@email", txtEmailID.Text);
cmd.Parameters.AddWithValue("@username", txtUsername.Text);
cmd.Parameters.AddWithValue("@password", txtPassword.Text);
cmd.Parameters.AddWithValue("@status", 1);
cmd.Parameters.AddWithValue("@created_by",man);
cmd.Parameters.AddWithValue("@LoginAttempts", 0);
cmd.Parameters.Add("@autoGenId", SqlDbType.Int).Direction = ParameterDirection.Output;
cmd.ExecuteNonQuery();
autoGenId = Convert.ToInt32(cmd.Parameters["@autoGenId"].Value);
cmd = new SqlCommand("Update [dbo].[UserDetail2] set LoginAttempts=0 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
MessageBox.Show("User Detail was added successfully", "Task", MessageBoxButtons.OK, MessageBoxIcon.Information);
conn.Close();
this.Close();
}
The program executes well some extent only! The problem i am facing is every i execute the program,i am getting value as
0 in field:
created_by in table:
UserDetail2 for all users,even though each user is created by different manager!
Given below is structure of table:
UserDetail2 in sql server2008:
ColumnName DataType AllowNulls
user_id(auto-increment primary key) Int No
user_first_name nvarchar(50) Yes
user_last_name nvarchar(50) Yes
user_dob date Yes
user_sex nvarchar(20) Yes
email nvarchar(60) Yes
username nvarchar(25) Yes
password nvarchar(15) Yes
status bit Yes
created_by Int Yes
LoginAttempts Int Yes
row_upd_date datetime Yes
What i want is value of variable
mid(in login form(frmLogin) which contains value of manager_id of currently logged in manager of application to be passed to value of field:
created_by in table:
UserDetail2 upon creation of new user by that particular manager.
So my question is am i going in right track in terms of getting manager_id of currently entered/logged in manager in application?If so tell me what modifications must i need to do in my c# code and where to achieve my required result? Can anyone help me please! Can anyone help me/guide me to solve my problem! Any help/guidance in solving of this problem would be greatly appreciated!
Submit an article or tip