Can't update DataTable to sql DataBase

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C#3.0

C#

public SomeMethod{

DataSet ds = new DataSet();

            SqlCommand testCaseCommand = new SqlCommand(pTestCaseTableQueryString, SQLconnection);
            this._testCaseDataAdapter = new SqlDataAdapter(testCaseCommand);
            this._testCaseCommandBuilder = new SqlCommandBuilder(_testCaseDataAdapter);
            //this._testCaseDataAdapter.Fill(testCaseDataTable);
            this._testCaseDataAdapter.Fill(ds, "QualityCheckTestCaseTable");
            this._testCaseDataAdapter.DeleteCommand = this._testCaseCommandBuilder.GetDeleteCommand(true);
            this._testCaseDataAdapter.UpdateCommand = this._testCaseCommandBuilder.GetUpdateCommand(true);
            this._testCaseDataAdapter.InsertCommand = this._testCaseCommandBuilder.GetInsertCommand(true);
            this._testCaseSourceBindingSource = new BindingSource();
            this._testCaseSourceBindingSource.DataSource = ds;
            this._testCaseSourceBindingSource.DataMember = "QualityCheckTestCaseTable";

            SqlCommand designerItemCommand = new SqlCommand(pDesignerItemQuertyString, SQLconnection);
            this._designerItemDataAdapter = new SqlDataAdapter(designerItemCommand);
            this._DesignerItemCommandBuilder = new SqlCommandBuilder(this._designerItemDataAdapter );
            //this._designerItemDataAdapter.Fill(designerItemDataTable);
            this._designerItemDataAdapter.Fill(ds,"AnticipationDesignerItemTable");
            this._designerItemDataAdapter.DeleteCommand = this._DesignerItemCommandBuilder.GetDeleteCommand();
            this._designerItemDataAdapter.UpdateCommand = this._DesignerItemCommandBuilder.GetUpdateCommand();
            this._designerItemDataAdapter.InsertCommand = this._DesignerItemCommandBuilder.GetInsertCommand();

            var relation = new DataRelation("TestCaseRelation", ds.Tables["QualityCheckTestCaseTable"].Columns["TestCaseID"],
                            ds.Tables["AnticipationDesignerItemTable"].Columns["RTestCaseID"]);

            ds.Relations.Add(relation);

            this._designerItemBindingSource = new BindingSource();
            this._designerItemBindingSource.DataSource = this._testCaseSourceBindingSource;
            this._designerItemBindingSource.DataMember = "TestCaseRelation";
}

public SaveTableToSQL()
{
     this._testCaseDataAdapter.Update(QualityCheckTestCaseTabl);

     this._designerItemDataAdapter.Update(AnticipationDesignerItemTable);
}

when i modify AnticipationDesignerItemTable, it can work. But when i modify QualityCheckTestCaseTable, have nothing to change

tthanks