Does Try-Catch in C#/Java affect execution speed [closed]

Normally it has no effect on code as long as no exception is thrown. When exception is thrown it usually slows up the application as it is a costly operation. However there is on very interesting discussion here which you should read about.

Since your app is database-driven, I'd say that most likely the time taken by the database calls will dwarf any performance penalties introduced by the try/catch blocks. If try/catch is the appropriate construct for what you are trying to do, then by all means do so.

Not sure about Java, but in C#, the cost is extremely low, however, I question the logic of doing this. I prefer the Yoda method. Do or do not. There is no try.

What would you have the catch blocks do? If you are interested in logging, you can use exception filters (CATCH WHEN in VB.NET) to capture information about an exception as it is first occurring and use reflection to log all sorts of data.

try catch blocks are executed only when ur program gets error by getting unexpected input. otherwise it just used to set flag. so its not affect execution time or speed.

It affect when u unhandled exception and unhandled exception cause low performance
check this out may be its helpful Tyr/Catch

For example you had put some code on combobox Selected index change event

 private void cmbMedium_SelectedIndexChanged(object sender, EventArgs e)
        {
           //Some Code
        }  

And you set DataSource or Add Items in combobox on Form Load event than while setting DataSource or Adding Items cmbMedium_SelectedIndexChanged Event trigger
At this time some people put unhandled Exception on cmbMedium_SelectedIndexChanged like this

private void cmbMedium_SelectedIndexChanged(object sender, EventArgs e)
{
  Try
     {
       //Some Code
     }
  catach(Exception ex)
     {}
}  

Than this type of Unhandled Exception Causes Low performance

Yes, Try/Catch affect your performance. For more information please check this link.