Nested If and Try statements?

Question

Im a bit new to C# and the syntax so please forgive my ignorance. I have a dotnet page using a C# code behind file and in the C# code there is a try/catch statement with some nested IF/ELSE statements inside it. I need to perform another validation after the initial TRY but before all the IF/ELSE statements. Can you open another try clause before closing it with a catch? Here is an example, Is that syntax correct and can you nest TRY's?

TRY
{
   TRY{
      IF {
            blah;
            }
      ELSE {
            blah;
            }
      CATCH {
      stuff;
      }
CATCH {
blah;
}
}

Brandon Lewis · Answer

Actually works like this: try { try { if { blah; } else { blah; } } catch { stuff; } catch { blah; } Try-catch blocks can be nested within one another but for simple code samples its not usually necessary. Also try blocks must be followed by either catch catch-finally or finally blocks to be syntatically correct. Ex: try { //Try to execute some code. } catch ( ) { //Catch any exceptions. } try { //Try to execute some code. } catch ( ) { //Catch any exceptions thrown. } finally { //This code will execute no matter if an exception //is thrown or the code executes successfully. } try { //Try to execute some code. } finally { //This block will execute regardless //of if an exceptions is thrown or not. } You cannot build a try-catch-finally block without ending it in either catch or finally. But you can nest them as much as you see fit so long as you follow the syntax :) Also another nifty tip. If you want to store information for a particular exception that is thrown you can set up your catch parameter list like this: try { //Try to excecute some code. //This code may thrown in InvalidOperationException. } catch ( InvalidOperationException ex) { //For console apps Console .WriteLine(ex.Message); //For windows apps MessageBox .Show(ex.Message Notice); } You can custom catch exceptions and log them or rethrow them with a friendly error message like this: try { //Try to execute some code //This code may throw a FileNotFoundException } catch ( FileNotFoundException ex) { throw new FileNotFoundException (Unable to find .); } Probably a little more than you were looking for but Im sure itll suit you well later on :)