The files use a different language,which is not allowed since they need to be compiled together Solution in asp.net

Introduction: In this article I am going to explain How to solve the error/exception “The files use a different language, which is not allowed since they need to be compiled together”. In previous articles i explained The GridView 'GridView1' fired event PageIndexChanging which wasn't handled Error solution in asp.net  and Solution to FileUpload control is not working in UpdatePanel and The SelectCommand property has not been initialized before calling 'Fill' Gridview error solution and  How to Solve Error Control 'GridView1' of type 'GridView' must be placed inside a form tag with runat=server and How to solve WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for 'jquery'. Please add a ScriptResourceMapping named jquery(case-sensitive).

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Description: While working on asp.net application I created web services in two different languages i.e. C# and Vb.Net. The code behind file of the web services goes to App_Code folder by default.When I run the application I got the error “The files use a different language, which is not allowed since they need to be compiled together” as shown in image.

I searched for the solution to this problem on google search and then find the appropriate solution. Actually this error/exception occurs due to compiling two different languages together (in our case C# and VB.net). 

Solution Implementation:  The solution to this error is to create separate folder for each language code file. E.g. create a sub folder in App_Code folder and name it “CsCodes” and place the C# code files in this folder. Similarly create another sub folder in the App_Code folder and name it “VbCodes” and place the VB.Net code files in this folder. Now a little configuration is to be made in web.config file. Open web.config file and in the <complilation> tag write the following lines as:

<compilation debug="true">

      <codeSubDirectories>

        <add directoryName="CsCodes"/>

        <add directoryName="VbCodes"/>

      </codeSubDirectories>

</compilation>

Note: Here codeSubDirectories maps to App_Code folder and directoryName maps to the sub folders created in the App_Code folders (in our case CsCodes and VbCodes)

Now run the application. It will work.

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