Set Default Value in Dropdownlist in Asp.net Using C#

This article will show you how you can set the default value to dropdownlist control in asp.net using c#.net from database ms sql server.

So in this article  first I will tell you how you can bind the drop down and then i will tell you how you can set the default value from code behind in your c# code.

So first we will create a database table

After creating the table we will add some data in it.

Now here is the dropdown on your page

<asp:DropDownList ID="ddlcountry" runat="server"></asp:DropDownList>

Now here is the code to bind the dropdown, and set the default value to the drop down.

//Data base connection string             string connection = @"Server=LAPTOP-EVJEKV38\SQLEXPRESS; Database=TestDB; Integrated Security=True";             SqlConnection con = new SqlConnection(connection);             try             {                 DataTable dt = new DataTable();                 //Sql query                               string query = "Select * from  CountryMaster;";                 //Execute the query                 SqlDataAdapter da = new SqlDataAdapter(query, con);                 con.Open();                 da.Fill(dt);                 //Bind the dropdown                              ddlcountry.DataSource = dt;                 ddlcountry.DataTextField = "CountryName";                 ddlcountry.DataValueField = "Id";                 ddlcountry.DataBind();                 //------------Set the default value-------------                 ddlcountry.Items.Insert(0, new ListItem("--Select Country--", "0"));             }             catch             {             }             finally             {                 con.Close();             }

In above code please check the highlighted part of the code rest code is for binding the dropdown list.

ddlcountry.Items.Insert(0, new ListItem("--Select Country--", "0"));

The above code is used for setting the default value of the dropdown list in asp.net.  Now run the page and check the output.