search data in datagridview using distinct 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 dataentry
{
    public partial class Distinct : Form
    {
        public Distinct()
        {
            InitializeComponent();
        }
        string column;
        string orders;
        SqlConnection asdf = new SqlConnection("Data Source=.;Initial Catalog=dataentry;Integrated Security=True;Pooling=False");
        private void button9_Click(object sender, EventArgs e)
        {
           
            SqlDataAdapter data = new SqlDataAdapter("Select * from register order by " + textBox1.Text + " " + orders + "", asdf);
            DataTable ss = new DataTable();
            data.Fill(ss);
            dataGridView1.DataSource = ss;
        }


        private void textBox1_TextChanged(object sender, EventArgs e)
        {


        }


        private void radioButton1_CheckedChanged(object sender, EventArgs e)
        {
            column = "Name";
        }


        private void radioButton3_CheckedChanged(object sender, EventArgs e)
        {


            column = "Status";
        }


        private void radioButton4_CheckedChanged(object sender, EventArgs e)
        {


            column = "Salary";
        }


        private void radioButton2_CheckedChanged(object sender, EventArgs e)
        {
            column = "Gender";
        }


        private void radioButton5_CheckedChanged(object sender, EventArgs e)
        {
            orders = "asc";
        }


        private void radioButton6_CheckedChanged(object sender, EventArgs e)
        {
            orders = "desc";
        }
         }
}

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