[Solved] C# WPF check if checkbox is checked error [duplicate]

Question

IsChecked is a nullable boolean, which means it can have three states. Nullable types are denoted by the ? you see in the error.

Try this:

if ((bool)checkbox1.IsChecked == true)

Accepted Answer

IsChecked is a nullable boolean, which means it can have three states. Nullable types are denoted by the ? you see in the error.

Try this:

if ((bool)checkbox1.IsChecked == true)