DataGrid - BUG or WRONG ?????!

Question

hello :) i have a problem :( i write these codes : DataGridCell myCell ; DataTable myTable = new DataTable() ; myCell = datagridCustomer .CurrentCell; string CU_ID = myTable.Rows[myCell.RowNumber][0].ToString(); it works true at normal use ! BUT when i cliked on the column Header and change sort of a column , its dataset doesnot refresh and these codes return false data ! what can i do ? is it a BUG of grid ? plz help thanx