how can i download binarydata from server using gridattachmentcolumn?

[Tirumalesh]

This is default page code:
protected void grdFiles_ItemCommand(object source, GridCommandEventArgs e)
    {
        if (e.CommandName == RadGrid.DownloadAttachmentCommandName)
        {
            
                GridDownloadAttachmentCommandEventArgs args = e as GridDownloadAttachmentCommandEventArgs;
                string fileName = args.FileName;
                int attachmentId = (int)args.AttachmentKeyValues["ProjectFileId"];
                ProTrakEntities objEntity = new ProTrakEntities();
                ProjectFile objFile = (from type in objEntity.ProjectFiles where type.ProjectFileId == attachmentId select type).First();
                string filename = objFile.FileName;
                string Filetype = objFile.FileType;
                byte[] binaryData = (byte[])objFile.FileData;
             
                Response.Clear();
                Response.ContentType = Filetype;
                Response.AddHeader("content-disposition", "attachment; filename=" + fileName);
                Response.BinaryWrite(binaryData);
                Response.End();
            
        }
    }

**Uploaded file Code**
 protected void DetailsView1_ItemInserting(object sender, DetailsViewInsertEventArgs e)
    {
        if (DetailsView1.CurrentMode == DetailsViewMode.Insert)
        {
            if (Session["ProjectId"] != null)
            {
                int Projectid = Convert.ToInt32(Session["ProjectId"]);
                string Description = (DetailsView1.FindControl("RadEditor1") as RadEditor).Content;
                RadAsyncUpload radAsyncUpload = DetailsView1.FindControl("RadAsyncUpload1") as RadAsyncUpload;
                UploadedFile file = radAsyncUpload.UploadedFiles[0];
                string s = file.FileName;
                string path = System.IO.Path.GetFileName(s);
                    string Contenttype = radAsyncUpload.UploadedFiles[0].ContentType;
                int fileSize = radAsyncUpload.UploadedFiles[0].ContentLength;
                float length = float.Parse(fileSize.ToString());
                byte[] fileData = new byte[file.InputStream.Length];
                file.InputStream.Read(fileData, 0, (int)file.InputStream.Length);
                        ProTrakEntities objEntity = new ProTrakEntities();
                        ProjectFile objFile = new ProjectFile();
                        objFile.ProjectId = Projectid;
                        objFile.FileName = s;
                        objFile.FileType = Contenttype;
                        objFile.FileSize = length;
                        objFile.CreatedBy = "admin";
                        objFile.CreatedDate = DateTime.Now;
                        objFile.Description = Description;
                        objFile.FileData = fileData;
                        objEntity.AddToProjectFiles(objFile);
                        objEntity.SaveChanges();
                
            }
         }
    }
I'm saving the data in database in binaryfromat.i data was not downloading from sever when i click the attachmentcolumn.

[Veli]

Hi Tirumalesh,

The sample code you provided seems fine. Can you verify the following things:

1. Response.ContentType contains a valid content type value (e.g. "image/jpeg", "application/octet-stream", etc.)
2. Binary data is retrieved successfully from your data layer and the binaryData variable contains a valid byte array representation of your attachment.
3. Ajax is disabled by the time of the download, if you are using it.

Veli
the Telerik team