Assembly: mscorlib (in mscorlib.dll)
An attempt was made to set the property to null.
An attempt was made to set the property to a multidimensional array or to a single-dimensional array with a length that is not exactly 7.
The DateTimeFormatInfo object is read-only.
If setting this property, the array must be one-dimensional and must have exactly seven elements.
If a custom format string includes the "dddd" format specifier, DateTime.ToString returns the value of the appropriate member of in place of "dddd" in the custom format string.
This property is affected if the value of the Calendar property changes.