N Using Dropdown Control In Asp Web From With This Code Its Work Fine But When I Use This Code In Asp Winform Its Give Me Error What I Can Do?

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ASP.NET

WinForms

C#3.5

private void populatesocietyname()
{
string CS = ConfigurationManager.ConnectionStrings["SocietyCS"].ConnectionString;
using (SqlConnection con = new SqlConnection(CS))
{
SqlCommand cmd = new SqlCommand("Select SocietyID,SocietyFullName from tblsociety", con);
con.Open();
SqlDataReader rdr = cmd.ExecuteReader();
ddlsocietyname.DataTextField = "SocietyFullName";
ddlsocietyname.DataValueField = "SocietyID";
ddlsocietyname.DataSource = grdr;
ddlsocietyname.DataBind();
ddlsocietyname.Items.Insert(0, n
ew ListItem("-- Select Society Name --", "0"));
}
}

This code in win form give error i tried to change the datatext to valuedisplay a datavaluefield to valuedisplay but it give error at datasource how i can solve this?