Hi.. We have to create the datatable as below..

DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("Id", typeof(int)));
dt.Columns.Add(new DataColumn("Name", typeof(string)));
DataRow dr;
dr = dt.NewRow();

dr[0] = 0;
dr[1] = "Select a Category";
dt.Rows.Add(dr);
for (int i = 0; i < argCategory.Length; i++)
{
dr = dt.NewRow();
dr[0] = argCategory[i].Id;
dr[1] = argCategory[i].Name;
dt.Rows.Add(dr);
}
DataView dv = new DataView(dt);
return dv;