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Verify data in textbox

Posted on 2009-05-08
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Last Modified: 2012-05-06
How would I verify the data in a textbox is in the following time format:

nn:nn or n:nn
It has to contain numeric data and the colon character in the format above.
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Question by:Richard Kreidl
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13 Comments
 
LVL 1

Expert Comment

by:malvagia
ID: 24336855
Use a regular expression validator.
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LVL 2

Author Comment

by:Richard Kreidl
ID: 24336885
Not sure how a expression validator works..

Please show examples.
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LVL 1

Expert Comment

by:malvagia
ID: 24336978
<asp:regularexpressionvalidator id="RegularExpressionValidator1" runat="server" controltovalidate="Textbox1" validationexpression="^[0-9]?[0-9]{1}:[0-9]{2}$" />
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LVL 41

Expert Comment

by:guru_sami
ID: 24336979
can you give exact expression you are looking for...with eg.
The expression cold look somethinglike this: ^([0-9]+):([0-9]+)
thats just a try ..not tested. so please provide example.
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LVL 2

Author Comment

by:Richard Kreidl
ID: 24336999
Examples of valid data:

8:30
12:30
1:30
2:00
10:00
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LVL 41

Expert Comment

by:guru_sami
ID: 24337052
try this ^[0-9]{1,2}:[0-9]{2} as ValidationExpression for your RegularExpressionValidator control
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LVL 2

Author Comment

by:Richard Kreidl
ID: 24337068
Not sure how to code a expression validator control????
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LVL 41

Expert Comment

by:guru_sami
ID: 24337094
To check for empty textbox you can use RequiredFieldValidator Control  in combination with RegularExpressionVC
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LVL 41

Expert Comment

by:guru_sami
ID: 24337110
Here is the example:
Make sure ValidationGroup Property is set as in the e.g.
 <asp:TextBox ID="Txthr" runat="server" ValidationGroup="Txthr1"></asp:TextBox>
      <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" 
          ControlToValidate="Txthr" ErrorMessage="RequiredFieldValidator" 
          ValidationGroup="Txthr1">*</asp:RequiredFieldValidator>
      <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" 
          ControlToValidate="Txthr" ErrorMessage="RegularExpressionValidator" 
          ValidationExpression="^[0-9]{1,2}:[0-9]{2}" ValidationGroup="Txthr1">*</asp:RegularExpressionValidator>
      <asp:Button ID="Button2" runat="server" Text="Button" ValidationGroup="Txthr1" />

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LVL 2

Author Comment

by:Richard Kreidl
ID: 24337153
You're using an asp example. I need to use this validation code on a Windows form for a textbox.
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LVL 41

Expert Comment

by:guru_sami
ID: 24337223
Sorry..My bad... Not a WinForm guy...but here are my closed googled example on winForms:

http://msdn.microsoft.com/en-us/library/ms996428.aspx
http://www.codeproject.com/KB/mcpp/YuvalidatingTextBox.aspx
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LVL 1

Accepted Solution

by:
malvagia earned 2000 total points
ID: 24337269
Sorry, I have been programming web apps lately.
For a win form try something like this in the buttons click event:


Dim reg as new Regex
reg = @"^[0-9]?[0-9]{1}:[0-9]{1}$"
Dim valid as bool
valid = reg.IsMatch(Textbox1.Text)

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LVL 2

Author Closing Comment

by:Richard Kreidl
ID: 31579482
thanks
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