Why am I getting this exception? - C#

There are many different types of built-in exception classes in .NET.

You’ll see some more often than others, however it’s helpful to have a basic understanding of all of them, as you’ll likely encounter each one at least once!

Most common exceptions

Below is a list of the most common .NET exceptions:

| Exception Type | Why was the exception thrown? | --- | --- | ArgumentException | A non-null argument was passed into a method that was invalid. | | ArgumentNullException | An argument that should not be null was passed into a method. | | ArgumentOutOfRangeException | A non-null argument passed into a method was outside the valid range. | | DivideByZeroException | There was an attempt to divide a numerical value by zero. | | FileNotFoundException | Unable to find a file at the specified location. | | FormatException | The specified value is not in the required format (typically when converting to another format). | | IndexOutOfRangeException | An array index is outside the lower or upper bounds of an array or collection. | | InvalidOperationException | A method call is invalid within an object’s current state. | | KeyNotFoundException | The specified key for accessing a member in a collection does not exist. | | NotSupportedException | The called method or operation is not supported. | | NullReferenceException | There was an attempt to access members of a null object. | | OverflowException | Raised when an arithmetic, casting, or conversion operation results in an overflow. | | OutOfMemoryException | There is not enough memory to perform the current operation. | | StackOverflowException | A stack in memory has overflown (typically due to excessively deep or infinite recursion) | | TimeoutException | The time interval allotted to an operation has been exceeded. |