LearnExpression Support Forum / Expression Programs / Microsoft Expression Blend / Null Reference error when updating TextBlock / Latest PostsInstantForum.NET v4.1.4LearnExpression Support Forumhttp://forums.learnexpression.com/dustin@learnexpression.comFri, 21 Nov 2008 07:30:31 GMT20Null Reference error when updating TextBlockhttp://forums.learnexpression.com/Topic1398-5-1.aspxI'm working on an interface to a piece of equipment that communicates through a serial port. I have a slider on the interface and want to display the changed values of the slider in a TextBlock using the value_changed event. The TextBlock is recognized by intellisense but when I run the app I get an XMLParserError / null reference error that points to the TextBlock. If I assign a value to the Text property of the TextBlock anywhere else in the code-behind file, - no problem, but putting it in the value_changed event throws the error.<br>Any help?Sun, 22 Jun 2008 15:53:58 GMTrablinz