C# checking white space in a textbox -

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how can check in c# there white space in textbox , perform operation after that?

this ensures multiple spaces caught in check. 

 bool hasallwhitespace = txtbox1.text.length>0 &&                          txtbox1.text.trim().length==0;

to check single space only:

 bool hassinglewhitespace = txtbox1.text == " ";

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