How To Call .cs File From A .aspx.cs

Dec 10, 2010

I have a a1.aspx.cs file and i have created new class1.cs file. I want to call a function in a1.aspx.cs which is in class1.cs

When i write a method in a1.aspx.cs everything works fine, but when i try to copy paste the contents which are there in button click event into class1.cs file and call that function i am unable to get all the controls that i have used in my web page,what parameters am i supposed to pass??

and error comes as

Error 1 The name 'DropDownList1' does not exist in the current context

and many more such errors. how to call a function in a1.aspx.cs

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