validate the dropdownlist in asp.net using csharp

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Design screen as follows

Label (To show the message)

Faculty Name Dropdownlist

Month Dropdownlist

Year Dropdownlist

I have one button Show

When i click the Show button i want to validate if any of the above Faculty Name,Month and Year
is not selected.

i want to show the message in label.

For example if faculty name is not selected show the message Faculty Name is not selected.

for that how can i vaidate in asp.net using csharp.

regards,
narasiman P.

Posted 30-Sep-13 2:24am

Member 8054539

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Thanks7872 30-Sep-13 8:27am

Do you have access to google.com?

3 solutions

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MK-Gii · Answer 1 · 2013-09-30T02:56:00

Solution 1

Simply check if the value in dropdown is not null.

C#

if(ComboBox.SelectedItem == null)
    //do something about it

Posted 30-Sep-13 2:56am

MK-Gii

**Azee** · Answer 2 · 2013-09-30T02:58:00

Solution 2

Try RequiredFieldValidator:

http://www.w3schools.com/aspnet/control_reqfieldvalidator.asp[^]

All the best.

Azee...

Posted 30-Sep-13 2:58am

Azee

Sandesh M Patil · Answer 3 · 2013-09-30T03:03:00

Solution 3

Refer below article

Introduction to ASP.NET validation[^]

Posted 30-Sep-13 3:03am

Sandesh M Patil