How to convert string into decimal?

I text box i have a value:

1212,12

Additionally my text box have a mask:

MaskType=Numeric
EditMask='n2'

i try to parse it:

var culture = CultureInfo.CreateSpecificCulture("en-US");
var value = decimal.Parse(myTextBox.Text, culture);

but get value=121212 when expected value=1212.12

What can be wrong?