I want to check for the existence of the variable session("MyVariable") on my user control. If it does not exist or is unassigned then I want to query the database and assign Session("MyVariable") to a value. Otherwise, if the variable exists I want to do nothing. Is there way to do this?
In ColdFusion we use ParameterExists() or IsDefined(). is there an equivalent in ASPX?

Thanks

All you need to do is this:

If Session.Item("MyVariable") Is Nothing Then
    'assign it here.
End If

Peter
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Work smarter, not harder.

if u are using c-sharp
you could do as below:
if(Session[""]!=null)
{}
else
{}