I have created a number of ASPX Files
In each of these Files There are some common lines of codes
I have stored these lines in a text file. and included the file
in my ASPX file using the statement

This works only for the Client Side

Is there any such method where i can include a text file within
my server side script as well

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huh??!?!

Look up User Controls and see if that's what you're looking for.

When you write .NET code, you can compile the server code into an assembly (.DLL). And code that runs from this assembly (i.e. ASPX page code-behind) can access any public classes that are in that assembly. This is how you create a code library.

This differs greatly from the old ASP way of doing this where (as your question demonstrates) you created a common file for functions and had to include this in every page that wanted to use it. The programming model is entirely different.

Please describe your environment a little more and perhaps we can provide you some direction. What are you coding with? Notepad, Web Matrix, Visual Studio? What kind of code are you trying to include?