error in using handler to show image from database

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C#

ASP.NET

Hi,
i want to show the image from database to image control. so that i searched in net and i found handler is the way to show image from database and i tried one code from net but its not working.

>>>>handler code<<<<<<br mode="hold" />
public void ProcessRequest(HttpContext context)
    {
         Int32 empno;
       if (context.Request.QueryString["eid"] != null)
            empno = Convert.ToInt32(context.Request.QueryString["id"]);
       else
            throw new ArgumentException("No parameter specified");
 
       context.Response.ContentType = "image/jpeg";
       Stream strm = ShowEmpImage(empno);
       byte[] buffer = new byte[4096];
       int byteSeq = strm.Read(buffer, 0, 4096);
 
       while (byteSeq > 0)
       {
           context.Response.OutputStream.Write(buffer, 0, byteSeq);
           byteSeq = strm.Read(buffer, 0, 4096);
       }       
       //context.Response.BinaryWrite(buffer);
    }
 
    public Stream ShowEmpImage(int empno)
    {
    SqlConnection connection = new SqlConnection("........");

        string sql = "SELECT image FROM exp2 WHERE eid =@eid";
        SqlCommand cmd = new SqlCommand(sql,connection);
        cmd.CommandType = CommandType.Text;
        cmd.Parameters.AddWithValue("@eid", empno);
        connection.Open();
        object img = cmd.ExecuteScalar();
        try
        {
            return new MemoryStream((byte[])img);
        }
        catch
        {
            return null;
        }
        finally
        {
            connection.Close();
        }
      
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

>>>>>page code<<<<

Image1.ImageUrl = "~/ShowImage.ashx?id=" + eid;

This is the code in this its showing error(The name 'eid' does not exist in the current context) in my page code..... i think i have to declare eid but i dont know where....... any one pl help me....