Update database

Im trying to update the content in the database but it doesnt work i dont understand why. I commented most of the code tell me if something is unclear Get content code: //if creating new file use textbox1 rather then the double clicked data cell string fns = ""; if (open == false) { dataGridView1.CurrentCell = this.dataGridView1[0, e.RowIndex]; fns = dataGridView1.CurrentCell.Value.ToString(); } else { //use filename box (file creation) fns = textBox1.Text; } // get content where name == fns SqlConnection sql = new SqlConnection(sqlcon); a = new SqlDataAdapter("SELECT [Content], [primkey], [Name] FROM Keeper WHERE [Name] ='" + fns + "'", sqlcon); try { a.Fill(s, "Keeper"); foreach (DataRow dr in s.Tables[0].Rows) { dataGridView2.DataSource = s; dataGridView2.DataMember = "Keeper"; } //get content from datagrid insert into richtextbox dataGridView2.CurrentCell = this.dataGridView2[0, 0]; richTextBox1.Text = dataGridView2.CurrentCell.Value.ToString(); } catch (SqlException sqlexcp) { MessageBox.Show(sqlexcp.Message.ToString()); } //close connection, reset bool, bring up editor sql.Close(); open = false; richTextBox1.BringToFront(); Save content: //get content from textbox insert into datagrid dataGridView2.CurrentCell = this.dataGridView2[0, 0]; dataGridView2.CurrentCell.Value = richTextBox1.Text; //update DB SqlCommandBuilder mySqlCommandBuilder = new SqlCommandBuilder(a); a.Update(s, "Keeper");