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compare validator asp.net, c#

Posted on 2009-05-08
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Last Modified: 2013-12-17
Hi i have the following code

 <asp:RegularExpressionValidator ID="Year" runat="server" ControlToValidate="txtdate"
            ErrorMessage="Please Enter yyyy-mm" ValidationExpression="(19|20)\d\d-(0[1-9]|1[012])"></asp:RegularExpressionValidator>

which makes sure that the date entered is on yyyy-mm format

i also have two text bos one is txtDate which is start date and the other is txtEnddate,

What i want to do is compare it so that the end date is never less than start bearing in mind the format i have given.

Please help


Thanks,

R8VI
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Question by:R8VI
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Expert Comment

by:NazoUK
ID: 24334708
<asp:CompareValidator runat="server" ControlToValidate="txtEndDate" ControlToCompare="txtDate" Operator="GreaterThanEqual" Type="Date" ErrorMessage="End Date must not be before Start Start" />
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Author Comment

by:R8VI
ID: 24334770
Hi,

thanks for thsi but this doens twork in the sense for example if i put 1999-04 as start date and then put 1999-01 as end date the validation works no problem but then if i put in correct information for example as 1999-06 as end date validation will still appear.

Please help

Thanks,

R8VI
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LVL 21

Expert Comment

by:Tapan Pattanaik
ID: 24334817
hi R8VI,

               you have add a CompareValidator control in your page, which helps u to compare between your txtDate textBox and textEnddate textBox.
<asp:CompareValidator ID="CompareValidator1" runat="server" 

            ControlToCompare="txtDate" ControlToValidate="textEnddate" ErrorMessage="end date is never less than start" 

            Operator="GreaterThanEqual" Type="Date"></asp:CompareValidator>

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LVL 21

Expert Comment

by:Tapan Pattanaik
ID: 24334858
hi R8VI,
              check the link for regular expression.

http://www.regular-expressions.info/regexbuddy/dateyyyymmdd.html
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Author Comment

by:R8VI
ID: 24334931
Hi, thanks for this here is the code but doesnt work i have the regular expression validator thats works so no problem just trying to get the compare validator to work first

<asp:TextBox ID="txtdate" runat="server"></asp:TextBox>
     
        <asp:CompareValidator ID="CompareValidator5" runat="server"
            ControlToCompare="txtdate" ControlToValidate="txtenddate" ErrorMessage="end date is never less than start"
            Operator="GreaterThanEqual" Type="Date"></asp:CompareValidator>
              <asp:TextBox ID="txtenddate" runat="server"></asp:TextBox>
        <asp:Label ID="lblLabeltest" runat="server" Text="End Date must not be before Start Start" Visible="false"></asp:Label>

please help,

Thanks,

R8VI
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LVL 15

Accepted Solution

by:
NazoUK earned 500 total points
ID: 24335145
In this case you'd have to use a custom validator that inspects the values in the two textboxes, breaks up the numbers and works out if they are valid. You can't use a standard compare operator as you aren't actually using valid dates.
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Author Comment

by:R8VI
ID: 24335248
ahhh ok kul thanks
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