i Use datalist And Also use 4 radiobutton list in datalist

//Clear the existing selected row

foreach (GridViewRow oldrow in GridView1.Rows)

{

((RadioButton)oldrow.FindControl("RadioButton1")).Checked = false;

}

//Set the new selected row

RadioButton rb = (RadioButton)sender;

GridViewRow row = (GridViewRow)rb.NamingContainer; ((RadioButton)row.FindControl("RadioButton1")).Checked = true;

protected void RadioButton1_CheckedChanged(object sender, EventArgs e) { //Clear the existing selected row  foreach (GridViewRow oldrow in GridView1.Rows) { ((RadioButton)oldrow.FindControl("RadioButton1")).Checked = false; } //Set the new selected row RadioButton rb = (RadioButton)sender; GridViewRow row = (GridViewRow)rb.NamingContainer; ((RadioButton)row.FindControl("RadioButton1")).Checked = true; }