Doubt in Gridview and sqlserver

If xRs.HasRows = True Then

               Dim dt As New DataTable()
               Dim dr As DataRow = Nothing
               dt.Columns.Add(New DataColumn("SI", GetType(String)))
               dt.Columns.Add(New DataColumn("Name", GetType(String)))
               dt.Columns.Add(New DataColumn("Age", GetType(String)))
               dt.Columns.Add(New DataColumn("Sex", GetType(String)))

               Do While xRs.Read()
                   RowCount = RowCount + 1
                   dr = dt.NewRow()
                   dr("SI") = RowCount
                   dr("Name") = Trim(xRs!Name)
                   dr("Age") = Trim(xRs!Age)
                   dr("Sex") = Trim(xRs!sex)  
                   dt.Rows.Add(dr)
               Loop

               ViewState("CurrentTable") = dt
               GridView01.DataSource = dt
               GridView01.DataBind()
           End If