Combo Population using n Tier Architecture C#

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Hi,
I am using n tier architecture, in that I need to populate the combo box named category. The database table name is ItemCategory and the fields are categoryID and CategoryName. When I click on the drop down box in my design I need to show all the data inside CategoryName.
Please help me.

Posted 13-Apr-14 20:05pm

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syed shanu 14-Apr-14 2:28am

So what is the problem .and what is here drop down box and combo box

My Doubt 14-Apr-14 2:33am

I have a drop down list I need to populate db values to that.

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sankarsan parida · Accepted Answer · 2014-04-13T20:28:00

Solution 1

Hope so you are using combox it' means this is windows application.
See there is no confusion for databinding in a combobox. When you want see data in combobox which is exists in databse.You need to bind data in page load event. for this you need to get list of data in a DataSet or DataTable or in List of object. Just collect the data from your layer(It may be a business layer) and bind to datasource of combobox

Ex.
private void Page_Load(Object sender,EventArgs e)
{
List<itemcategory> listCategory=objBusinessLayer.GetItemCategories();
cmbItemCategory.DataSource=ListCategory;
cmbItemCategory.DataTextField="CategoryName";
cmbItemCategory.DataValueField="categoryID";
}
</itemcategory>

A Tool to create N-Layer Architecture Classes[^]
N-Tier: Begginer's guide in designing their application[^]

Posted 13-Apr-14 20:28pm

sankarsan parida

Updated 13-Apr-14 20:50pm

v2

Comments

My Doubt 14-Apr-14 2:39am

private void BindCategoryName()
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["name"].ConnectionString);
con.Open();
SqlCommand cmd = new SqlCommand("Select CategoryID,CategoryNamefrom ItemCategory", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
ddlCategory.DataSource = dt;
ddlCategory.DataTextField = "Category Name";
ddlCategory.DataBind();
ddlCategory.Items.Insert(0, new ListItem(String.Empty, String.Empty));
ddlCategory.SelectedIndex = 0;
}

in page load I call BindCategoryName();

My Doubt 14-Apr-14 2:40am

But my code is direct it doesnot uses any layer structure. I need to populate values using layers data layer, business layer and presentation layer.
Please Help me

[no name] 14-Apr-14 2:50am

So you need to study how to make layer structure, right!
See some links which is edited my links