ASP.net C#.pass textbox value from aspx to ashx

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C#

ASP.NET

i have a table in database with name and image with binary data(image) i want to load the image on the basis of name given in text box

string strQuery = "select img from exp where name='" + TextBox1.Text + "'";

this is fine in aspx but in image handler ashx file i want to pass the value of this textbox so that the same sql query can be applied

till now my handler file is

using System;

using System.Web;

using System.Data.SqlClient;


 public class ShowImage : IHttpHandler
    { 

        public void ProcessRequest(HttpContext context)
        {

            string imageid = context.Request.QueryString["img"];


            SqlConnection con = new SqlConnection("server=.\\SQLEXPRESS;database=experiment;trusted_connection=true;");
            con.Open();
            SqlCommand command = new SqlCommand("select img from exp where (here i stuck....)", con);
            SqlDataReader dr = command.ExecuteReader();
            dr.Read();
            context.Response.BinaryWrite((Byte[])dr[0]);
            con.Close();
            context.Response.End();
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }