combobox

Question

I have 2 combobox for ClassStandard Subject when i select one ClassStandard that coressponing Subjects will display in 2nd combobox .give me the c# code Using ACCESS database using windows application

rashmi kc · Answer

. thank you very much How to do with 3 combobox

Satyapriya Nayak · Answer

Hi Rashmi Try this... App.config using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Data.OleDb; namespace Combobox { public partial class Form1 : Form { string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings[dsn]; OleDbCommand com; string str; public Form1() { InitializeComponent(); } private void Form1_Load(object sender EventArgs e) { comboBox1.Items.Add(Choose ClassStandard); OleDbConnection con = new OleDbConnection(ConnectionString); con.Open(); str = select * from student; com = new OleDbCommand(str con); OleDbDataReader reader = com.ExecuteReader(); while (reader.Read()) { comboBox1.Items.Add(reader[ClassStandard]); } } private void comboBox1_SelectedIndexChanged(object sender EventArgs e) { comboBox2.Items.Clear(); OleDbConnection con = new OleDbConnection(ConnectionString); con.Open(); str = select * from student where ClassStandard=' + comboBox1.Text.Trim() + '; com = new OleDbCommand(str con); OleDbDataReader reader = com.ExecuteReader(); while (reader.Read()) { comboBox2.Items.Add(reader[Subject].ToString()); } con.Close(); reader.Close(); } } } Thanks If this post helps you mark it as answer