Help!! dataadapter.update(dataset,table) is either throwing errors or not updating?

[saapphire]

here is my code..

 
 private void button2_Click(object sender, EventArgs e)
        {
 
            String str1 = "select * from table1";
            dad1 = new SqlDataAdapter(str1, con);
            dad1.Fill(ds,"table1");
 
        SqlCommandBuilder cmdbuild = new SqlCommandBuilder(dad1);      
 
            DataRow drow2 = ds.Tables["table1"].NewRow();
 
            drow2[1] = "chop";
            drow2[2] = 10;
 
            ds.Tables["table1"].Rows.Add(drow2);
 
            dad1.Update(ds,"table1");
 
            MessageBox.Show("done");
        }
 

i am a new bee and would very much appreciate your help because i am able to retrieve information but not insert any row nor update any row.. when i run the program either it throws errors like update() parameters is wrong, or, it does not throw any error (executing the messagebox command )but when i check my database table, i find my table not updated!!!!

PS: i checked the dataset designer for my table and it had an sql query Fill,Getdata(), so i added another called insertquery() but then i am not able to figure out how to access this query from the form!!!