How to save the dataset.acceptchanges( ) to database

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C#

Hai....
I am updating the rows of dataset and saving the changed rows by using ds.acceptchanges() method. It is making changes in Dataset, But i have to save only the updated rows of dataset to Database.... So i am using the code like this, but it did not make any changes to database.

adap = new SqlDataAdapter("select * from customer1", con);
ds = new DataSet();
adap.Fill(ds);
SqlCommandBuilder cb = new SqlCommandBuilder(adap);
foreach (DataRow dr in ds.Tables[0].Rows)
{
if (dr[0].ToString() == TextBox1.Text)//text box have data of first column of a row
{
dr[1] = TextBox2.Text;//text box have data of second column of a row
dr[2] = TextBox3.Text;//text box have data of third column of a row
} 
}
ds.AcceptChanges();
adap.Update(ds);
GridView1.DataSource = ds;
GridView1.DataBind();

Can anybody help me where i was wrong....
Thanks.........