how to catch all exception in c# code example

Example 1: c# multiple catch exceptions

// if C# v6+, you can use exception filters
catch (Exception ex) when (ex is FormatException || ex is OverflowException)
{
  // do something
}

Example 2: test how catch exception c#

[TestMethod]
[ExpectedException(typeof(ArgumentException),
    "A userId of null was inappropriately allowed.")]
public void NullUserIdInConstructor()
{
   LogonInfo logonInfo = new LogonInfo(null, "P@ss0word");
}