Check if multi line textbox is empty?

I currently have the following XAML:

<TextBox Text="" x:Name="textFeedbackFeedback"
         Margin="11.593,0,29.307,42.96" TextWrapping="Wrap"
         VerticalContentAlignment="Top" VerticalAlignment="Bottom"
         Height="92.08" AcceptsReturn="True" VerticalScrollBarVisibility="Visible"/>

I have tried using a lot of variations of:

if(textFeedbackFeedback.text == "")

if(textFeedbackFeedback.text开发者_Python百科 == null)

if(textFeedbackFeedback.text == string.Empty)

if(string.IsNullOrEmpty(textFeedbackFeedback.Text))

But for some reason it doesn't stop there and continues as if there is data in there, can someone help me out here.

Thanks.

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try if(string.IsNullOrWhiteSpace(textFeedbackFeedback.Text))

if that doesn't work, try finding out the length of the text, and the integer/ascii values of the chracters in the text.

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You could try using the .Trim() function on the text to eliminate any white space that might be in there.