ultra grid updating

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SQL-Server-2005

C#3.0

C#

, +

Can anybody help me?
I used the following code for inserting to one table and to update the field by setting name as primarykey on-another table . On debuging if i select a name to display the content to ultra grid it show the exception like ... 'Dynamic SQL generation for the UpdateCommand is not supported against a SelectCommand that does not return any key column information'. ... "my code is marked below:

private void button2_Click(object sender, EventArgs e)
{

    DataTable dts = new DataTable();
    int u;
    u = dt.DefaultView.Table.Rows.Count;
    SqlDataAdapter da1 = new SqlDataAdapter();
    //DataTable dts = new DataTable();
    connect c = new connect();
    SqlConnection s1 = c.con1();
    //DataSet ds = new DataSet("electrical");
    SqlCommand cm = new SqlCommand("select BILLNO,NAME,CONTRACTOR,SITE, COMPANY,PRODUCT,PRODUCTTYPE,QTY,MRP,RATE,AMT,[DISCOUNT%],TOTAL ,DATE from credit", con);
    da1.SelectCommand = cm;
    SqlCommandBuilder cmbuilder = new SqlCommandBuilder(da1);//auto generate the UpdateCommand,InsertCommand and DeleteCommand
    dts.Clear();
    //dt.Clear();
    da1.Fill(dts);
    if (comboBox5.Text == "")
    {
        comboBox5.Text = "";
    }
    if (comboBox4.Text == "")
    {
        comboBox4.Text = "";
    }
    if (comboBox6.Text == "")
    {
        comboBox6.Text = "";
    }
    DataRow row = null;
    DataColumn column1 = new DataColumn("BILLNO", typeof(int));
    dt.Columns.Add(column1);
    DataColumn column14 = new DataColumn("DATE", typeof(DateTime));
    dt.Columns.Add(column14);
    DataColumn column2 = new DataColumn("NAME", typeof(string));
    dt.Columns.Add(column2);
    DataColumn column3 = new DataColumn("CONTRACTOR", typeof(string));
    dt.Columns.Add(column3);
    DataColumn column4 = new DataColumn("SITE", typeof(string));
    dt.Columns.Add(column4);


    for (int i = 1; i <= u; i++)
    {
        row = dt.Rows[i - 1];
        row["BILLNO"] = int.Parse(textBox1.Text);
        row["DATE"] = dateTimePicker1.Value.ToShortDateString();
        row["NAME"] = comboBox5.Text;
        row["CONTRACTOR"] = comboBox4.Text;
        row["SITE"] = comboBox6.Text;
    }

    this.ultraGrid1.BindingContext[dts].EndCurrentEdit();
    this.ultraGrid1.PerformAction(UltraGridAction.DeleteRows);
    dts = dt;
    ////
    //DataSet dst = new DataSet();
    //da1.InsertCommand = cmbuilder.GetInsertCommand();
    ////da1.UpdateCommand = cmbuilder.GetUpdateCommand();
    //da1.Update(dst.Tables[0].Select(null, null, DataViewRowState.CurrentRows));

    ////DataSet ds2 = new DataSet("electricals");
    da1.Update(dts);
    //da1.Update(dst.Tables["credit"].Select(null, null, DataViewRowState.CurrentRows));//, "credit");


    dt.Columns.Remove(column1);
    dt.Columns.Remove(column14);
    dt.Columns.Remove(column2);
    dt.Columns.Remove(column3);
    dt.Columns.Remove(column4);
    MessageBox.Show("Updated");
    // dt.Clear();
    // dts.Clear();

    this.BeginInvoke(new MethodInvoker(this.SetActiveCell));

    try
    {
        if (comboBox5.Text == "")
        {
            comboBox5.Text = "";
        }
        if (comboBox4.Text == "")
        {
            comboBox4.Text = "";
        }
        if (comboBox6.Text == "")
        {
            comboBox6.Text = "";
        }
        connect c1 = new connect();
        c1.idu("insert into creditcustomer values(" + textBox1.Text + ",'" + comboBox5.Text + "','" + dateTimePicker1.Value.ToShortDateString() + "','" + comboBox4.Text + "','" + comboBox6.Text + "'," + textBox7.Text + "," + textBox12.Text + "," + textBox2.Text + "," + textBox12.Text + ")");
        MessageBox.Show("inserted");
        connect cc4 = new connect();
        DataTable dtt4 = cc4.select(" select COMPANY,PRODUCT,RATE,QTY,AMT ,TOTAL from credit where BILLNO=" + textBox1.Text + "");
        dgv.DataSource = dtt4;
    }
    catch (Exception)
    {
        connect cc = new connect();
        cc.idu(" update creditcustomer set BILLNO=" + textBox1.Text + ",DATE='" + dateTimePicker1.Value.ToShortDateString() + "',TOTALAMOUNT=" + textBox7.Text + ",CURRENTBALANCE= " + textBox12.Text + ", PAID = " + ptxt17.Text + ", BALANCE=" + textBox12.Text + " where NAME='" + comboBox5.Text + "'");
        MessageBox.Show("ITEMS ADDED");
        connect c4 = new connect();
        DataTable dt4 = c4.select(" select CONTRACTOR,SITE,CONVERT (VARCHAR(10),DATE,103) AS DATE, TOTALAMOUNT from creditcustomer where BILLNO=" + textBox1.Text + "");
        dgv.DataSource = dt4;

    }
}

How can I avoid the error? Please help me.

Thanks in advance