Checking if the textbox has a semicolon

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Hi! How can I check if the data entered in textbox has a semicolon. I am aware that I should use the regex condition, but I don't get how to properly implement the semicolon on the condition. Any help? Thank you in advance.

Posted 25-Feb-13 4:48am

jmpapa

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[no name] 25-Feb-13 10:51am

What have you tried? Using RegEx just to check for a semicolon is like trying to use a nuclear missile to drive a single nail in to a board.

Shelby Robertson 25-Feb-13 11:21am

lol

Richard C Bishop 25-Feb-13 10:52am

You can use the RegularExpression validator provided by ASP.Net and add the regular expression to the validator and map it to the control you want to validate.

3 solutions

Solution 3

Hi,
You can also use string.Contains() method to check existance of a string in another string.

Example-:

C#

bool hasSemiColon=textBox1.Text.Contains(";");

Posted 25-Feb-13 5:54am

Deepak_Sharma_

Updated 25-Feb-13 7:30am

v2

Comments

ridoy 25-Feb-13 13:30pm

+5

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Nick Fisher (Consultant) · Accepted Answer · 2013-02-25T05:09:00

Solution 2

You can use the IndexOf method as described above of course, but there is a method called Contains that is especially designed for this:

C#

if (myTxtBox.Text.Contains(";"))
{
    // box contains a ; so do something here
}

Posted 25-Feb-13 5:09am

Nick Fisher (Consultant)

Updated 25-Feb-13 5:11am

v2

Comments

Joezer BH 25-Feb-13 11:50am

5+

ridoy 25-Feb-13 13:30pm

+5

abhijeetgupta1988 · Accepted Answer · 2013-02-25T04:56:00

Solution 1

use string method IndexOf to find the semicolon from text.

IndexOf:
This method finds the first index of the char argument. It returns -1 if the char was not found.

e.g.

C#

string x = txtValue.Text;
bool hasSemicolon = x.IndexOf(';') == -1 ? false : true;

Posted 25-Feb-13 4:56am

abhijeetgupta1988

Updated 25-Feb-13 5:23am

v2