c# code for search or filter data in datagridview by using textbox with respect to combobox in .net

This is A C# Practice code:

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.SqlClient;


namespace search
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=dataentry;Integrated Security=True");
        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            if (comboBox1.Text == "ID")
            {
                SqlDataAdapter sda = new SqlDataAdapter("SELECT CUS_ID, CUS_NAME, MOB_NO, CITY, LAND_LINE_NO, ADDRESS FROM CUS_ENTRY where cus_id like '"+textBox1.Text+"%'", con);
                DataTable dt = new DataTable();
                sda.Fill(dt);
                dataGridView1.DataSource = dt;
            }
            else if (comboBox1.Text == "Name")
            {
                SqlDataAdapter sda = new SqlDataAdapter("SELECT CUS_ID,CUS_NAME, MOB_NO, CITY, LAND_LINE_NO, ADDRESS FROM CUS_ENTRY where CUS_NAME like '"+textBox1.Text+"%'", con);
                DataTable dt = new DataTable();
                sda.Fill(dt);
                dataGridView1.DataSource = dt;
            }
        }


        private void Form1_Load(object sender, EventArgs e)
        {


        }
    }
}

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