//page load
.
.
DataTable dt2 = new DataTable();
DataColumn col;
col = new DataColumn("empid", System.Type.GetType(" System.Int32"));
//add this column empid into datatable dt2
dt2.Columns.Add(col);
col = new DataColumn("empname", System.Type.GetType("System.String"));
dt2.Columns.Add(col);
col = new DataColumn("Remarks", System.Type.GetType("System.String"));
dt2.Columns.Add(col);
col = new DataColumn("Country", System.Type.GetType(" System.Int32"));
dt2.Columns.Add(col);

dt2.AcceptChanges();

Gridview1.Datasorce=dt2;//binding the data table to gridview
Gridview1.Databind();