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Friday, 3 April 2020

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

4/03/2020 - By Pranav Singh 0


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.



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