How bind image to gridview

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C#

ASP.NET

Hello everyone,
I take image using file upload and save it into database (Sql server)by using byte array. My image datatype id image.
I take one asp handler to bind image to gridview.
But at the time of execution the handler give error image_id is not valid column.
**************
My code is
.aspx file
In gridview my image field is

<asp:TemplateField>
                <ItemTemplate>
                   <asp:Image runat="server" ID="grdvwimg" ImageUrl='<%#"ModelHandler.ashx?id="+Eval("mdl_id")%>' Height="150px" Width="150px" />
               </ItemTemplate>

*********

.cs

public void bind()
       {

         cmd = new SqlCommand();
           con = new SqlConnection(strConnString);
           cmd.CommandType = CommandType.StoredProcedure;
           cmd.Parameters.AddWithValue("@Flag", 13);
           cmd.CommandText = "StoreProcedureSelect";

           cmd.Connection = con;
           try
           {
               con.Open();
               SqlDataAdapter da = new SqlDataAdapter(cmd);
               DataSet ds = new DataSet();
               da.Fill(ds);
               grdvwModel.DataSource = ds;
                 grdvwModel.DataBind();
              }
           catch (Exception ex)
           {
               throw ex;
           }
              }

************************
hamdler.ashx

<pre> public void ProcessRequest(HttpContext context)
       {
           try
           {
               con = new SqlConnection(strConnString);
               string imageid = context.Request.QueryString["id"];
               SqlCommand command = new SqlCommand("SELECT  mdlimg FROM Model WHERE mdl_id = 'imageid'", con);
               con.Open();
               SqlDataReader dr = command.ExecuteReader();
               dr.Read();
               context.Response.BinaryWrite((Byte[])dr[0]);

               context.Response.End();
           }
           catch (Exception ex)
           {
               throw ex;
           }

       }

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