Add numbers in c#

Question

i have a numerical textbox which I need to add it\'s value to another number I have tried this code

String add = (mytextbox.Text + 2)

but

Answer 1

int intValue = 0;
if(int.TryParse(mytextbox.Text, out intValue))
{
    String add = (intValue + 2).ToString();
}

I prefer TryPase, then you know the fallback is going to be zero (or whatever you have defined as the default for intValue)