dt.Merge(dt1);
dt.Columns.Add("Center", typeof(string));
foreach (DataRow dr in dt.Rows)
{
dr["Center"] = dr["gov_center_Name"].ToString();
}
foreach (DataRow dr in dt.Rows)
{
if (dr["Center"] == "")
dr["Center"] = dr["pri_center_Name"].ToString();
}
comboBox1.DataSource = dt;
comboBox1.DisplayMember = "Center";