Updata Sql Server Database Table

   string Dir = Directory.GetCurrentDirectory().Substring(0, Directory.GetCurrentDirectory().Length - 10);
			string DBpath = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Dir.ToString() + @"\db3.mdb;Persist Security Info=True";
			OleDbConnection con = new OleDbConnection(DBpath);
			string sql = "update student set name='" + textBox2.Text + "',mejor='" + textBox3.Text + "' where studentid=" + textBox1.Text;
			OleDbCommand cmd = new OleDbCommand(sql, con);
			con.Open();
			cmd.ExecuteNonQuery();
			con.Close();

			button2_Click(sender, e);

عفوا اخي

string Dir = Directory.GetCurrentDirectory().Substring(0, Directory.GetCurrentDirectory().Length - 10);
			string DBpath = @"مكات الداتا سورس" ";
			SqlConnection con = new SqlConnection(DBpath);
			string sql = "update student set name='" + textBox2.Text + "',mejor='" + textBox3.Text + "' where studentid=" + textBox1.Text;
			SqlCommand cmd = new SqlCommand(sql, con);
			con.Open();
			cmd.ExecuteNonQuery();
			con.Close();