Validating content of a text box in C#

Question

1.00/5 (1 vote)

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how to validate text boxes ?while text boxes are blank of int type then i am getting input type is not in correct format

[Edit]Title updated[/Edit]

Posted 28-Aug-13 1:34am

rakeshojha12345

Updated 28-Aug-13 2:03am

Thomas Daniels

v2

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vangapally Naveen Kumar 28-Aug-13 7:35am

can you explain more........

[no name] 28-Aug-13 7:41am

yaah! i am trying to store int type data through a text box but if there is no data then it is not taking null because it has int type of data in database and error is input data is not in correct format

[no name] 28-Aug-13 7:47am

can you explain it briefly

[no name] 28-Aug-13 7:36am

What you want to validate..??

[no name] 28-Aug-13 7:43am

i want to validate text boxes. so that if user leave it blank and click submit then it should arises error or message.

V.Lorz 28-Aug-13 7:45am

ASP.Net or WinForms?
In ASP.Net JScript + regexps are probably the best choice

[no name] 28-Aug-13 7:48am

winforms.....

[no name] 28-Aug-13 7:51am

The title of your question and the narrative in your posting have nothing to do with each other. Please find something more appropriate to your question to copy/paste into the title section. You need to describe your problem better. The content of the textbox will always be a string type and will never be an int type. So, "blank of int type" makes no sense at all. You would really benefit from getting a decent book on programming. The type/quality of your questions suggest that you are attempting to learn programming one basic question at a time. No one can teach you programming in a forum posting. It takes practice, research and study.

[no name] 28-Aug-13 7:55am

i mean to say that if user leave text boxes blanks then it should arises some information

[no name] 28-Aug-13 8:09am

Okay so what is the problem? Are you unable to check and see if the textbox.Text property is equal to an empty string? Can you write an "if" statement? Can you not compare string values? FYI The String class has a handy method called IsNullOrEmpty or IsNullOrWhitespace that you could use. If you had read a book on programming, you would probably know how to do this by the end of the second chapter.

4 solutions

Solution 3

C#

          if ( textbox.Text =="" )
          {
              // then assign ur variable null
          }
          else
          {
              // do your coding
          }

it helps pls select as answer

Posted 28-Aug-13 2:30am

ErBhati

Solution 4

try this I think this is what you need.............

if (textbox1.Text==""){
messagebox.show("You cannot leave the textbox blank.");
}
else {
//your code here
}

please accept as answer.......

Reagards,
Ahsan Naveed.

Posted 29-Aug-13 20:24pm

Ahsan98

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Code-Hunt · Accepted Answer · 2013-08-28T01:47:00

Solution 2

demo_reqfieldvalidator[^]

see this...

Posted 28-Aug-13 1:47am

Code-Hunt

Comments

V.Lorz 28-Aug-13 7:52am

In the example the validator will run in the server and will not validate the format. While redering the page you may inject the jscript code for validating the text editor using one regex.
Does any one remember if client side validators exist for this task?

[no name] 28-Aug-13 9:02am

in the same way i want that until select the image using dialog box submit process can not be done

V.Lorz · Accepted Answer · 2013-08-28T01:42:00

One way:

C#

try
{
    int TheInt = int.Parse( textbox.Text );

    // If it continues format was OK
}
catch
{
    // If exception thrown, format was not Ok,
}

Another:

C#

int TheInt;

if (int.TryParse( textbox.Text, out TheInt ))
{
    // Format was OK
}
else
{
    // Format was not Ok,
}

Yet another: try using regular expressions: Validation with Regular Expressions Made Simple[^]