File Upload with three tier architecture

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C#

ASP.NET

LINQ

i want to upload a file from three tier architecture.

My architecture:
Contract Class Library :

public int ing_id { get; set; }
public byte image_content { get; set;}
public string Image_Type { get; set;}
public bool Image_Size { get; set;}

Data Class Library :

public static string ConnectionString
     {
         get { return ConfigurationManager.ConnectionStrings["SGMTConnectionString"].ConnectionString; }
     }

     public UploadRepositoryCategory()
     {
         _datacontex = new LeaveManagmentSystem.Data.DataAccess.DataAccessDataContext(ConnectionString);
     }


     public DataAccess.DataAccessDataContext _datacontex;

     public void Dispose()
     {
         _datacontex.Dispose();
     }

Business Class Library :

public void InsertImage(LeaveManagmentSystem.Contract.UploadCategory objUploadCategory)
      {
          using (UploadRepositoryCategory obj = new UploadRepositoryCategory())
          {
              obj.InsertImage(objUploadCategory);
          }
      }

Reference Are

[Contract]
[Data]<contract>
[Business]<Data,Contract>
[Project][Business,Data]

My Codes are for upload a images inside the grid.
On Button Click:

if (FileUpload1.PostedFile != null
&& FileUpload1.PostedFile.FileName != "")
{

byte[] myimage = new byte[FileUpload1.PostedFile.ContentLength];
HttpPostedFile Image = FileUpload1.PostedFile;
Image.InputStream.Read(myimage, 0, (int)FileUpload1.PostedFile.ContentLength);

SqlConnection myConnection = new SqlConnection("Your Connection String");
SqlCommand storeimage = new SqlCommand("INSERT INTO ImageGallery "
+"(Image_Content, Image_Type, Image_Size) "
+" values (@image, @imagetype, @imagesize)", myConnection);
storeimage.Parameters.Add("@image", SqlDbType.Image, myimage.Length).Value = myimage;
storeimage.Parameters.Add("@imagetype", SqlDbType.VarChar, 100).Value
= FileUpload1.PostedFile.ContentType;
storeimage.Parameters.Add("@imagesize", SqlDbType.BigInt, 99999).Value
= FileUpload1.PostedFile.ContentLength;

myConnection.Open();
storeimage.ExecuteNonQuery();
myConnection.Close();
} 

Handler:

public void ProcessRequest (HttpContext context)
{
  SqlConnection myConnection = new SqlConnection("YourConnectionString");
  myConnection.Open();
  string sql = "Select Image_Content, Image_Type from ImageGallery where Img_Id=@ImageId";
  SqlCommand cmd = new SqlCommand(sql, myConnection);
  cmd.Parameters.Add("@ImageId", SqlDbType.Int).Value = context.Request.QueryString["id"];
  cmd.Prepare();
  SqlDataReader dr = cmd.ExecuteReader();
  dr.Read();
  context.Response.ContentType = dr["Image_Type"].ToString();
  context.Response.BinaryWrite((byte[])dr["Image_Content"]);
  dr.Close();
  myConnection.Close(); 
 
} 

<asp:TemplateField>
 <ItemTemplate>
    <asp:Image ID="Image1" runat="server" ImageUrl='<%#    "Handler.ashx?id=" + Eval("Img_Id")  %>' />
 </ItemTemplate>
</asp:TemplateField>

GridView1.DataSource = FetchAllImagesInfo();
GridView1.DataBind();

public DataTable FetchAllImagesInfo())
{
  string sql = "Select * from ImageGallery"; 
  SqlDataAdapter da = new SqlDataAdapter(sql, "Your Connection String"); 
  DataTable dt = new DataTable(); 
  da.Fill(dt); 
  return dt;
}

Friends this code will work properly if i write this behind the page where are control are exist
But I want to write this code in proper way like Contract=>Data=>Business and then i want to connect this to the direct page