Object reference not set to an instance of an object.

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C#

C#4.0

dt2 = cmod.bind_grdview_city();
if(dt2.Rows.Count>0)

{
grdview_city.DataSource = dt2;
grdview_city.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCells);
}




i am using 3 tier archetecture----------------------below is my function that is calling...




public DataTable bind_grdview_city()
{
try
{
cmd.Parameters.Add("@opt", SqlDbType.Int).Value = 3;
dt = cn.getDBDatatable("proc_city", cmd);
return dt;
}
catch (Exception ex)
{
throw ex;
}
finally
{
cn.closeConnection();
}


}