SharePoint webpart not working on another server

Question

The newly created web part is working fine on local server but after deployed on the another server it is not working.Mainly the request is not going to the server when clicked on the submit button.

HTML code:

<div class="form-group">
    <div class="col-lg-offset-3 col-md-offset-3 col-sm-offset-3 col-lg-9 col-md-9 col-sm-9 col-xs-12">
        <asp:Button ID="btnEditWI" class="btn btn-custom" runat="server" Text="Submit" OnClick="EditWIUpload_Click" ValidationGroup="submitEdit"/>
        <input id="cancelEditWI" type="button" value="Cancel" class="btn btn-custom" name="Cancel" data-dismiss="modal" CausesValidation="false" />
    </div>
</div>

Server side code:

protected void EditWIUpload_Click(object sender, EventArgs e)
    {
        bool isValidate = validateForm();
        bool isCheckListIdExists = checkListExists();
        if (isValidate)
        {
            try
            {
                using (SPSite site = new SPSite(SPContext.Current.Web.Url))
                {

                    using (SPWeb web = site.OpenWeb())
                    {

                        SPSecurity.RunWithElevatedPrivileges(delegate()
                        {
                            if (fuWorkInstruction.HasFile)
                            {

                                SPDocumentLibrary documentLib = web.Lists["WorkInstruction"] as SPDocumentLibrary;
                                SPFileCollection files = documentLib.RootFolder.Files;
                                SPListItem chkItem = documentLib.GetItemById(strCheckListID);
                                string strChkId = chkItem["WorkInstructionID"].ToString();
                                chkItem.Delete();
                                Stream fStream = fuWorkInstruction.PostedFile.InputStream;
                                byte[] _byteArray = new byte[fStream.Length];
                                fStream.Read(_byteArray, 0, (int)fStream.Length);
                                fStream.Close();

                                web.AllowUnsafeUpdates = true;

                                Random rnd = new Random();
                                int fileRnd = rnd.Next(1000);

                                string fileExt = Path.GetExtension(fuWorkInstruction.PostedFile.FileName);
                                string fileName = Path.GetFileNameWithoutExtension(fuWorkInstruction.PostedFile.FileName) + fileRnd;
                                string _fileUrl = fileName + fileExt;


                                //string _fileUrl = documentLib.RootFolder.Url + "//" + fuWorkInstruction.PostedFile.FileName;
                                //string _fileUrl = Path.GetFileName(fuWorkInstruction.PostedFile.FileName);

                                bool IsOverwriteFile = true;
                                //SPFile file = documentLib.RootFolder.Files.Add(_fileUrl, _byteArray, IsOverwriteFile);

                                SPFile newFile = files.Add(documentLib.RootFolder.Url + "/" + _fileUrl, _byteArray, IsOverwriteFile);
                                SPList documentLibraryAsList = web.Lists["WorkInstruction"];
                                SPListItem item = documentLibraryAsList.GetItemById(newFile.ListItemAllFields.ID);



                                if (isCheckListIdExists)
                                {
                                    item["WorkInstructionID"] = strChkId;
                                }
                                else
                                {
                                    item["WorkInstructionID"] = txtID.Text;
                                }

                                item["Revision"] = txtRevision.Text;
                                item["Description"] = txtDescription.Text;
                                item["WorkRecordID"] = new SPFieldLookupValue(workRecId);
                                item.Update();
                                //newFile.CheckIn("New", SPCheckinType.OverwriteCheckIn);

                                web.AllowUnsafeUpdates = false;
                            }
                            else
                            {
                                web.AllowUnsafeUpdates = true;
                                SPDocumentLibrary documentLib = web.Lists["WorkInstruction"] as SPDocumentLibrary;
                                SPListItem item = documentLib.GetItemById(strCheckListID);
                                if (isCheckListIdExists)
                                {
                                    item["WorkInstructionID"] = item["WorkInstructionID"].ToString();
                                }
                                else
                                {
                                    item["WorkInstructionID"] = txtID.Text;
                                }
                                item["Revision"] = txtRevision.Text;
                                item["Description"] = txtDescription.Text;
                                item["WorkRecordID"] = new SPFieldLookupValue(workRecId);
                                item.Update();
                                web.AllowUnsafeUpdates = false;
                            }

                        });
                    }

                }
            }
            catch (Exception ex)
            {
                txtDescription.Text = ex.StackTrace.ToString();
            }
            txtID.Text = "";
            txtRevision.Text = "";
            txtDescription.Text = "";
        }

    }

Answer 1

Not sure what is the problem but if you rewrite your try and catch to use correctly the SPWeb and SPSite objects you might get some helpful error. In your example you are disposing objects before catch.

String str;
SPSite oSPSite = null;
SPWeb oSPWeb = null;

try
{
   oSPSite = new SPSite("http://server");
   oSPWeb = oSPSite.OpenWeb(..);

   str = oSPWeb.Title;
}
catch(Exception e)
{
   //Handle exception, log exception, etc.
}
finally
{
   if (oSPWeb != null)
     oSPWeb.Dispose();

   if (oSPSite != null)
      oSPSite.Dispose();
} 

https://msdn.microsoft.com/en-us/library/aa973248(v=office.12).aspx

Hope that will help to nail the problem.