Comparing strings in C with OR in an if statement

Question

I m a newbie to C   but can t seem to find anything about this problem   Here s what I m trying to do   string testString   txtBox1 Text  string testString2   txtBox2 Text   if   testString            testString2               MessageBox Show  You must enter a value into both boxes        return       Basically I need to check to see if either txtBox1 or txtBox2 is blank   However I m getting an error when running this   What s the proper way to do this  or is my approach all wrong

User · Answer

The code provided is correct  I don t see any reason why it wouldn t work  You could also try if  string1 Equals string2   as suggested   To do if  something OR something else   use      if  condition 1    condition 2

User · Answer

try   if  testString Equals testString2

User · Answer

Since you want to check whether textboxes contains any value or not your code should do the job  You should be more specific about the error you are having  You can also do   if textBox1 Text    string Empty    textBox2 Text    string Empty           MessageBox Show  You must enter a value into both boxes           EDIT 2  based on  JonSkeet comments   Usage of string Compare is not required as per OP s original unedited post  String Equals should do the job if one wants to compare strings  and StringComparison may be used to ignore case for the comparison  string Compare should be used for order comparison   Originally the question contain this comparison    string testString    This is a test   string testString2    This is not a test    if  testString    testString2          do some stuff      the if statement can be replaced with   if testString Equals testString2     or following to ignore case    if testString Equals testString2 StringComparison InvariantCultureIgnoreCase

User · Answer

use if  testString Equals testString2

User · Answer

Here s a more valid way which also check if your textbox is filled with only blanks      When spaces are not allowed if  string IsNullOrWhiteSpace txtBox1 Text     string IsNullOrWhiteSpace txtBox2 Text          give error        When spaces are allowed if  string IsNullOrEmpty txtBox1 Text     string IsNullOrEmpty txtBox2 Text           give error      The edited answer of  Habib OSU is also fine  this is just another approach

User · Answer

Try       if  textBox1 Text          textBox2 Text                         do something           Instead of       if  textBox1 Text    string Empty    textBox2 Text    string Empty                   do something           Because string Empty is different than -

[c#] Comparing strings in C# with OR in an if statement

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