validation on atext box

Question

0.00/5 (No votes)

See more:

hi!

i create a form which has two text box

in text box1 is for user id

where only "-" and "alphabets" are allowed in lower case

how i have to validate the text box1

Posted 25-Jul-11 22:03pm

kami124

Add a Solution

Comments

walterhevedeich 26-Jul-11 4:14am

ASP.Net? WinForms?

5 solutions

Solution 3

I assume you mean a ASP.NET page, if that is the situation then please try below,

C#

<asp:TextBox ID="txtTest" runat="server"></asp:TextBox>
<asp:RegularExpressionValidator ID="reValidatorTextBox" ControlToValidate="txtTest"
    ValidationExpression="^[a-zA-Z-]+$" runat="server" ErrorMessage="Only alphabets and -"></asp:RegularExpressionValidator>
<asp:Button ID="btnTest" runat="server" Text="Button" />

Hope it might help you :)

Posted 25-Jul-11 22:27pm

Mohammad A Rahman

Solution 1

Use Validating Event.
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.validating.aspx[^]

Posted 25-Jul-11 22:17pm

Prerak Patel

Solution 4

You can use Filtered textbox extender in ajax controls and set property as

FilterMode="ValidChars" ValidChars="qwertyuiopasdfghjklzxcvbnm-"

Posted 25-Jul-11 22:31pm

Aswathi Narayan

Solution 6

If you are using winforms, and you validate later, then try this:

foreach(char ch in TextBox1.Text.ToCharArray())
{
if(char.IsLetter(ch)== false || char.IsSeparator(ch) == false)
{
MessageBox.Show("User Id cannot contain values other than letters and separator");
}
}

Please mark as answered if you have found a correct solution.

Posted 25-Jul-11 23:22pm

Praveen Kullu

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2011-07-25T22:19:00

Handle the TextBox.KeyPress event:

private void myTextBox_KeyPress(object sender, KeyPressEventArgs e)
    {
    if (!((e.KeyChar >= 'a' && e.KeyChar <= 'z') || e.KeyChar == '-'))
        {
        e.Handled = true;
        }
    }

"i make this function can u please tell me what i have to use for "-" becouse seperator is not working"

private string RemoveNonAlphabets(string str)
            {	
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < str.Length; i++)
                {	
                    if(char.IsLetter(str[i]) || char.IsSeparator(str[i]))
                    sb.Append(str[i]);	
                }	return sb.ToString();
            }

To meet your original question objectives, use IsLower rather than IsLetter - the latter allows 'A'..'Z' as well as 'a'..'z'

Don't use IsSeparator - it checks for:

The Unicode standard recognizes three subcategories of separators:
Space separators (the UnicodeCategory.SpaceSeparator category), which includes characters such as \u0020.
Line separators (the UnicodeCategory.LineSeparator category), which includes \u2028.
Paragraph separators (the UnicodeCategory.ParagraphSeparator category), which includes \u2029.

(Taken from MSDN: http://msdn.microsoft.com/en-us/library/cta536cf.aspx[^])
Use '-' as in my example above.