//... DataGridTableStyle tableStyle = new DataGridTableStyle(); tableStyle.MappingName = "customers"; //... // make the dataGrid use new tablestyle and bind dataGrid1.TableStyles.Clear(); dataGrid1.TableStyles.Add(tableStyle); //Add a DataView DataView dv = new DataView(_dataSet.Tables["customers"]); dv.RowFilter = "country = 'USA'"; dataGrid1.DataSource = dv; //...Cetin