filter dropdown

Hi  Ajay,
Here is a windows form solution for your questions?


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 filter_dropdown
{
    public partial class Form1 : Form
    {
        string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["dsn"];
        OleDbCommand com;
        OleDbDataAdapter oledbda;
        DataSet ds;
        string str;
        DataTable dt;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            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["sname"]);
            }
            reader.Close();
            con.Close();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

            comboBox1.Items.Clear();
            OleDbConnection con = new OleDbConnection(ConnectionString);
            con.Open();
            str = "select sname from student where sname like '" + textBox1.Text + "%'";
            com = new OleDbCommand(str, con);
            oledbda = new OleDbDataAdapter(com);
            ds = new DataSet();
            oledbda.Fill(ds, "student");
            dt = ds.Tables["student"];
            int i;
            for (i = 0; i <= dt.Rows.Count - 1; i++)
            {
                comboBox1.Items.Add(dt.Rows[i].ItemArray[0]);
            }
            con.Close();
        }
    }
}



Thanks
If this post helps you mark it as answer

asp.net controls

Please mention when you ask a question about the control's related queries. This will help you getting the answer quickly.
Is it a windows forms control, or Asp.net control or WPF etc.