Help? How to get the sesson value from the programs by asp to programs by .net

Now , I want to write some web pages by .net and want to make an unique project with the old web pages by asp , the question is that i cant get sesson value from the programs by asp to programs by .net . What will I do ?
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[c#.net]
string what=Session["what"];

[asp]
session("what")="is that"
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(Maybe .net using the Hashtable )

Sorry for the poor English, and waiting for the help .thanks