The application is running successfully at the Local Host Server. But when we run it on the web server, the error is showing up. Server Error in '/' Application. Compilation Error Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: CS0246: The type or namespace name 'MySqlConnection' could not be found (are you missing a using directive or an assembly reference?) Source Error: Line 20: public partial class addnewproduct : System.Web.UI.Page Line 21: { Line 22: MySqlConnection con = new MySqlConnection(ConfigurationManager.ConnectionStrings["cnog"].ConnectionString); Line 23: string img_photo = "-1"; Line 24: string img_front = "-1"; Source File: d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\addnewproduct.aspx.cs Line: 22 Show Detailed Compiler Output: C:\Windows\SysWOW64\inetsrv> "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /t:library /utf8output /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.DataVisualization\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.DataVisualization.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.DynamicData\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.DynamicData.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.ApplicationServices\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.ApplicationServices.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Activities\v4.0_4.0.0.0__31bf3856ad364e35\System.Activities.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.IdentityModel\v4.0_4.0.0.0__b77a5c561934e089\System.IdentityModel.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_32\System.EnterpriseServices\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.EnterpriseServices.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.ServiceModel\v4.0_4.0.0.0__b77a5c561934e089\System.ServiceModel.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Windows.Forms\v4.0_4.0.0.0__b77a5c561934e089\System.Windows.Forms.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.ServiceModel.Activation\v4.0_4.0.0.0__31bf3856ad364e35\System.ServiceModel.Activation.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml.Linq\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.Linq.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.ServiceModel.Activities\v4.0_4.0.0.0__31bf3856ad364e35\System.ServiceModel.Activities.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.WorkflowServices\v4.0_4.0.0.0__31bf3856ad364e35\System.WorkflowServices.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Runtime.Serialization\v4.0_4.0.0.0__b77a5c561934e089\System.Runtime.Serialization.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_32\System.Web\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Web.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_32\System.Data\v4.0_4.0.0.0__b77a5c561934e089\System.Data.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.ServiceModel.Web\v4.0_4.0.0.0__31bf3856ad364e35\System.ServiceModel.Web.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.Entity\v4.0_4.0.0.0__b77a5c561934e089\System.Web.Entity.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Data.DataSetExtensions\v4.0_4.0.0.0__b77a5c561934e089\System.Data.DataSetExtensions.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.ComponentModel.DataAnnotations\v4.0_4.0.0.0__31bf3856ad364e35\System.ComponentModel.DataAnnotations.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\Microsoft.CSharp\v4.0_4.0.0.0__b03f5f7f11d50a3a\Microsoft.CSharp.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Deployment\v4.0_1.0.0.0__31bf3856ad364e35\System.Web.WebPages.Deployment.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.Extensions\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.Extensions.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Drawing\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Design\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Design.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Deployment\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.WebPages.Deployment.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Management\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Management.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll" /R:"C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.Services\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Web.Services.dll" /out:"C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.dll" /DEBUG /debug+ /optimize- /win32res:"C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\mpnekw3u.res" /w:4 /nowarn:1659;1699;1701;612;618 /warnaserror- "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.11.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.12.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.14.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.9.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.5.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.6.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.4.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.3.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.2.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.7.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.1.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.8.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.0.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.13.cs" "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\e9f0ddc1\afb186bc\App_Web_mpnekw3u.10.cs" Microsoft (R) Visual C# Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5 Copyright (C) Microsoft Corporation. All rights reserved. d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\buzfizlogin.aspx.cs(7,7): error CS0246: The type or namespace name 'MySql' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\Register.aspx.cs(7,7): error CS0246: The type or namespace name 'MySql' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\Register.aspx.cs(13,7): error CS0246: The type or namespace name 'CodeCarvings' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\Register.aspx.cs(16,7): error CS0246: The type or namespace name 'CloudinaryDotNet' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\Register.aspx.cs(17,7): error CS0246: The type or namespace name 'CloudinaryDotNet' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\login.aspx.cs(7,7): error CS0246: The type or namespace name 'MySql' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\addnewproduct.aspx.cs(8,7): error CS0246: The type or namespace name 'MySql' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\addnewproduct.aspx.cs(17,7): error CS0246: The type or namespace name 'CloudinaryDotNet' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\addnewproduct.aspx.cs(18,7): error CS0246: The type or namespace name 'CloudinaryDotNet' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\Vendorsignup.aspx.cs(7,7): error CS0246: The type or namespace name 'MySql' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\Vendorsignup.aspx.cs(14,7): error CS0246: The type or namespace name 'CodeCarvings' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\Vendorsignup.aspx.cs(17,7): error CS0246: The type or namespace name 'CloudinaryDotNet' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\Vendorsignup.aspx.cs(18,7): error CS0246: The type or namespace name 'CloudinaryDotNet' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\Verify_Vendor_Account.aspx.cs(7,7): error CS0246: The type or namespace name 'MySql' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\kvvesregistration.aspx.cs(7,7): error CS0246: The type or namespace name 'MySql' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\kvvesregistration.aspx.cs(16,7): error CS0246: The type or namespace name 'CloudinaryDotNet' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\kvvesregistration.aspx.cs(17,7): error CS0246: The type or namespace name 'CloudinaryDotNet' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\buzfizlogin.aspx.cs(14,5): error CS0246: The type or namespace name 'MySqlConnection' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\Register.aspx.cs(25,5): error CS0246: The type or namespace name 'MySqlConnection' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\login.aspx.cs(12,5): error CS0246: The type or namespace name 'MySqlConnection' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\addnewproduct.aspx.cs(22,5): error CS0246: The type or namespace name 'MySqlConnection' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\Vendorsignup.aspx.cs(21,5): error CS0246: The type or namespace name 'MySqlConnection' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\Verify_Vendor_Account.aspx.cs(13,5): error CS0246: The type or namespace name 'MySqlConnection' could not be found (are you missing a using directive or an assembly reference?) d:\inetpub\vhosts\buzfiz.com\asp.buzfiz.com\Krishna\kvvesregistration.aspx.cs(21,5): error CS0246: The type or namespace name 'MySqlConnection' could not be found (are you missing a using directive or an assembly reference?)
My guess is MySqlConnection is defined in a dll that's not on the production box. The other option is the web.config are registering different namespaces.