How to remove and add specific column in gridview in ASP.Net using C#

This post will guide you how to remove and add column in gridview in asp.net. In this example, I have a RadioButtonList and  gridview with four columns. When I click on Remove Column Tel radio button, Tel column will remove from gridview. And when I click on  Add Column Tel radio button, Tel column will add in gridview. Please examine code below:
Code Design :
<asp:RadioButtonList ID="Rdbshow" runat="server" AutoPostBack="true"                                 onselectedindexchanged="Rdbshow_SelectedIndexChanged">
     <asp:ListItem Value="1" >Remove Column Tel</asp:ListItem>             
     <asp:ListItem Value="2"> Add Column Tel </asp:ListItem>
 </asp:RadioButtonList> 
 

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">

    <Columns>     

      <asp:BoundField DataField="ID" HeaderText="ID" SortExpression="ID" />

      <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />

      <asp:BoundField DataField="Gender" HeaderText="Gender" SortExpression="Gender" />

       <asp:BoundField DataField="Tel" HeaderText="Tel" SortExpression="Tel" />

    </Columns>

</asp:GridView>

Code Behind : 

protected void Rdbshow_SelectedIndexChanged(object sender, EventArgs e)

{

    if (Rdbinvoice.SelectedValue.ToString() == "1")

    {

       // column Tel’s index is 3^rd of Gridview1

       // remove column Tel

       GridView1.Columns.RemoveAt(3);

    }else if (Rdbinvoice.SelectedValue.ToString() == "2")

    {

       BoundField colname = new BoundField();

       //Tell is the name of table field in database

       colname.DataField = "Tel";

       // Tell is the name of Gridview header

       colname.HeaderText = "Tel";

       //add column Tel

       GridView1.Columns.Add(colname);

    }

}

Done...:) :) . Now you can remove or add a Tel column in gridview by click on radiobuttonlist.