Use SqlDataAdapter to update database, but SqlCommandBuilder required

SqlDataAdapter da = new SqlDataAdapter();

SqlCommand cmd = new SqlCommand("select * from t_upload", conn);

da.SelectCommand = cmd;

SqlCommandBuilder cb = new SqlCommandBuilder(da);

DataSet ds = new DataSet();

da.Fill(ds, "upload");

DataRow newrow = ds.Tables[0].NewRow();

newrow["filesize"] = filesize;

newrow["filename"] = filename;

newrow["filecontent"] = content;

ds.Tables[0].Rows.Add(newrow);

fs.Close();

da.Update(ds, "upload");

conn.Close();