I don't know but I must have some thing wrog in my VS.Net system, because in my system Session["RegisterID"]=Session["RegistedId"].

So, could you try this bit of code in a sample form:

Session["badisID"] = "value";

mystring=Session["badisId"].ToString();

you will see that mystring="value"

Thanks. 

Case sensitivity problem

change your code to 

string mystring= "";

Session["badisID"] = "value";

if(Session["badisID"]!=null)

{ 

mystring=Session["badisID"].ToString();

 }

Hi rbadis,

This case-insensitive behavior is by design. I have answered it in your previous post. This duplicate thread will be closed. Thanks.

Sessions
http://forums.asp.net/t/1257716.aspx