combo

Question

I have a access database and tables fields like ClassCode(PK, autonumber) and class_standard
In the c# windows form m having one combobox , and when i select the class standard in the class combobox its classcode field value should be select.
how to do this

Satyapriya Nayak · Answer

Hi Rashmi, Try this... 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 Form2 : Form { string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["dsn"]; OleDbCommand com; string str; public Form2() { InitializeComponent(); } private void Form2_Load(object sender, EventArgs e) { comboBox1.Items.Add("Choose class_standard"); OleDbConnection con = new OleDbConnection(ConnectionString); con.Open(); str = "select * from class"; com = new OleDbCommand(str, con); OleDbDataReader reader = com.ExecuteReader(); while (reader.Read()) { comboBox1.Items.Add(reader["class_standard"]); } } private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) { comboBox2.Text = ""; OleDbConnection con = new OleDbConnection(ConnectionString); con.Open(); str = "select * from class where class_standard='" + comboBox1.Text.Trim() + "'"; com = new OleDbCommand(str, con); OleDbDataReader reader = com.ExecuteReader(); while (reader.Read()) { comboBox2.Text = reader["ClassCode"].ToString(); } con.Close(); reader.Close(); } } } Thanks If this post helps you mark it as answer

combo

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