How to assign html textbox value from code behind using c# ?

How to assign html textbox value from code behind using c# ?????

please dont say that, use runat="server" tag, because i am intentionally using html controls?

i know that how to READ the data from it : string value = Resquest.["textboxname"].ToString();

Using the above statement i am able to read the value of html control.

But, what i want is i want to Assign/set a value to that control.

Hope u understood.................