C# RegEx: RegularExpressionValidator

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Can any body tell me how I can validate a textbox control dynamicaally. There should only be 10 digits in the textbox. For this I have coded it as:

RegularExpressionValidator expvalidator = new RegularExpressionValidator();
            TextBox txt = new TextBox();
            txt.ID="txtComplainantContact";
            txt.Text=txtComplainantContact.Text;
            expvalidator.ControlToValidate =txt.ID; 
            
            expvalidator.ValidationExpression = @"\d\d\d\d\d\d\d\d\d\d";
            expvalidator.Display = ValidatorDisplay.Dynamic;
          
            if (expvalidator.IsValid)
            {
                ComplainantContact = txtComplainantContact.Text;
            }
            else
            {
                expvalidator.ErrorMessage = "plz enter 10 digits!!";
            }

Any help is greatly appreciated.

Posted 6-Jun-11 0:17am

mylogics

Updated 6-Jun-11 0:25am

Prerak Patel

v3

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Comments

Slacker007 6-Jun-11 6:24am

Text speak is not professional and using it here in Code Project is not a very good idea.

Ali Al Omairi(Abu AlHassan) 6-Jun-11 6:25am

call the method validate.

3 solutions

Solution 2

Hi,
try this
Txt.Maxlength =10;
Regards,
Lakshmi Narayanan.S

Posted 6-Jun-11 2:39am

naraayanan

Solution 1

1. You can use \d{10} instead of @"\d\d\d\d\d\d\d\d\d\d"
2. What is this : expvalidator.IsValid.IsValid?

Edit ----
Because the default value of this property is true, it will return true if you query this property before validation is performed. For example, this might occur if you attempt to use this property in the Control.Load event of a page.
Ref:http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.basevalidator.isvalid.aspx[^]

Here you have created a new control txt, that could be the problem. Try any existing textbox with same code.

Posted 6-Jun-11 0:22am

Prerak Patel

Updated 6-Jun-11 0:50am

v3

Comments

mylogics 6-Jun-11 6:24am

sory by mistake it expvalidator.IsValid but it always return true where am i wrong.

Prerak Patel 6-Jun-11 6:28am

Try this.Validate() before checking expvalidator.IsValid

mylogics 6-Jun-11 6:36am

no there is no such event for the txt

Prerak Patel 6-Jun-11 6:40am

It must be on page, which validates all controls. Try this.Validate()

mylogics 6-Jun-11 6:48am

it is working for this.validation but does not make sense and when am using it like expvalidator.Validate() it gives error object reference not set to an instance.

Prerak Patel 6-Jun-11 6:49am

I have updated my answer. Check that. Try any existing textbox.

mylogics 6-Jun-11 7:11am

no it does not i tried!!

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mylogics · Accepted Answer · 2011-06-06T02:44:00

finally got the solution like this:

XML

if (System.Text.RegularExpressions.Regex.IsMatch(txtComplainantContact.Text, @"\d\d\d\d\d\d\d\d\d\d"))
            {
            }
            else
            {
                Page.RegisterStartupScript("javascript", "<script>alert('Please Enter10 digit mobile number!!')</script>");
            }