How to check for equals? (0 == i) or (i == 0)

if(DialogResult.OK == MessageBox.Show("Message")) ...

if (InterstingValue1 == foo) { } else
if (InterstingValue2 == foo) { } else
if (InterstingValue3 == foo) { }

if ("SomeValue".equals(someString)) {
}

if(DialogResult.OK == MessageBox.Show("Message"))

if (DateClass.SATURDAY == dateObject.getDayOfWeek())

if (i = 0) {
}

:1 -> x

:if(1=x)