how to validate Dropdownlist in ASP.NET

[findtango]

hi to all i have a dropdownlist on page try to validate through RequiredfieldValidater BUT it is not working. i think the possible error in Initial value property of required field validator.. plz. help me how to implement validation on dropdownlist and sent some sample code if possble thanks john

[Pradip Kishore]

can you specify what exactly you want to validate..?

pradip kishore

[J4amieC]

I have used a RequiredFieldValidator for dropdown lists loads of times. The only thing to remember is to set InitialValue to whatever the value of your "Please Select" entry is.

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[unchecked]

Hi! What I did in my project is that, I inserted a new Listitem at index 0 of my dropdownlist with, say, value of "-1". then I added a CompareValidator control with properties: Type="String"; ControlToValidate="MyDropdownList"; ValueToCompare="-1" Operator="NotEqual"; coded like -> Note that the ValueToCompare's value is the same as the ListItem value I added to my dropdownlist, and the Operator is "NotEqual". hope it helps.. //mastereuo On Error Goto Hell

[J4amieC]

How is this any different to using a requiredFieldValidator and setting the InitialValue to -1 (in your example)

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[findtango]

i set initialvalue to -1 then, it is also not working???????

[Britney S Morales]

This my solution, you must to create a dropdownlist with only one item, the text is '-' y el value is the same... So, insert a COMPAREVALIDATOR and make this changes ControltoValidate: the dropdownlist Operator: Not Equal ValuetoCompare: - (Its the line) Thats all, the validator fireup if you choose the line value Best regards :rose:

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