error handling - using ex in syntax

[buddyr]

Hello,
I am using code with exception handling
C# - have visual studio 2008
code:
try{int mysum=Int.Parse (textbox1.text) ;}
catch{messagebo x.show("mistake " + ex.message);}

intellisense does not recognize ex.- is this syntax not correct syntax?
thank you

[tlhintoq]

You haven't defines ex anyplace

catch (Exception ex)
{
// handle exception here
}

[buddyr]

thank you that works