Binding Drop Down List in the grid view

protected void test_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                DropDownList ddl = (DropDownList)e.Row.FindControl("yourDropDownListID");
                ddl.DataSource = //assing your datasorce here to bind to your dropdown list
                ddl.DataBind();
            }
        }

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
Control ctrl = e.Row.FindControl("ddlName");
if (ctrl != null)
{
DropDownList ddl = (DropDownList)ctrl;
DataTable dt  =GetData(); // get your data either in list or datatable
ddl.DataSource = dt  ;    // Specify  here either list or datatable 
ddl.DataTextField = "Name"; // specify here  display Member
ddl.DataValueField = "Id"; // specify here  value member
ddl.DataBind();
}
}