Dataset BindingContext problem

Question

hi, i have problem with dataset. I create a form that has two textboxes, 1 datagrid and 4 buttons. textboxes are binding to dateset's columns. my problem is when i want to add a new record to dataset with "BindingContext[dataSet11, "deneme"].AddNew()" it adds a new row at the end of dataset with null values. And updates current row with values that i want to add to the last row of dataset. thanks for helps. Here Is My Code ---------------- //Fill's dataset private void button1_Click(object sender, System.EventArgs e) { dataSet11.Clear(); sqlDataAdapter1.Fill(dataSet11); dataGrid1.DataSource=dataSet11.Tables["deneme"]; } private void dataGrid1_Click(object sender, System.EventArgs e) { this.BindingContext[dataSet11,"deneme"].Position=dataGrid1.CurrentRowIndex; } //delete current row private void button4_Click(object sender, System.EventArgs e) { this.BindingContext[dataSet11, "deneme"].RemoveAt(this.BindingContext[dataSet11, "deneme"].Position); } //add new record to dataset private void button2_Click(object sender, System.EventArgs e) { BindingContext[dataSet11, "deneme"].AddNew(); BindingContext[dataSet11, "deneme"].EndCurrentEdit(); } //update current row private void button3_Click(object sender, System.EventArgs e) { //this.textBox1.DataBindings["Text"].BindingManagerBase.EndCurrentEdit(); BindingContext[dataSet11, "deneme"].EndCurrentEdit(); } //update database private void button5_Click(object sender, System.EventArgs e) { sqlDataAdapter1.Update(dataSet11); }