Ddl

using MySql.Data.MySqlClient;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
public partial class ImageRetrieve : System.Web.UI.Page
{
    string constr = "Data Source=localhost;port=3306;Initial Catalog=tbl;User Id=root;password=2525";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindGroupdropdown();
        }
    }
    protected void BindGroupdropdown()
    {
        MySqlConnection con = new MySqlConnection(constr);
        con.Open();
        MySqlCommand cmd = new MySqlCommand("select distinct Name from reg", con);
        MySqlDataAdapter da = new MySqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds);
        con.Close();
        ddlName.DataSource = ds;
        ddlName.DataTextField = "Name";
        ddlName.DataValueField = "Name";
        ddlName.DataBind();
        ddlName.Items.Insert(0, new ListItem("--Select--", "0"));       
    }
    private void BindGrid()
    {
        MySqlConnection con = new MySqlConnection(constr);
        MySqlCommand cmd = new MySqlCommand("SELECT * FROM images where Image_ID='"+ getImage_ID()+"'", con);
        MySqlDataAdapter da = new MySqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        da.Fill(dt);
        gvImages.DataSource = dt;
        gvImages.DataBind();
    }
    private int getImage_ID()
    {
        MySqlConnection con = new MySqlConnection(constr);
        con.Open();
        MySqlCommand cmd = new MySqlCommand("Select Image1_ID,Image2_ID from reg where Name='" + ddlName.SelectedItem + "'");
        cmd.Connection = con;
        MySqlDataReader reader = cmd.ExecuteReader();
        int i = 0;
        while (reader.Read())
        {
            foreach (DbDataRecord s in reader)
            {
                i = s.GetInt32(0);
                i = s.GetInt32(1);
            }
        }
        reader.Close();
        return i;
    }
    protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            byte[] bytes = (byte[])(e.Row.DataItem as DataRowView)["Image"];
            string base64String = Convert.ToBase64String(bytes, 0, bytes.Length);
            (e.Row.FindControl("Image1") as Image).ImageUrl = "data:image/png;base64," + base64String;
        }
    }
    protected void ddlName_SelectedIndexChanged(object sender, EventArgs e)
    {
        BindGrid();
    }
}