how to write the function and validate mutiple dropdownlist

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My code as follows

Student ID Dropdownlist1

Course Dropdownlist2

Course timings Dropdownlist3

i want to validate if any of the above 3 Dropdownlist is not selected want to show the message "Please select"

for that how can i validate drodpownlist in asp.net using c#.

Regards,
Narasiman P.

Posted 12-Nov-13 16:44pm

Member 8054539

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♥…ЯҠ…♥ 12-Nov-13 22:59pm

Show the message where? and you want common function to validate all the drop down list? where you wanna validate in button click event or where?

2 solutions

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♥…ЯҠ…♥ · Answer 1 · 2013-11-12T17:17:00

Hi Narasiman,

To validate the dropdownlist selection property you can use this function

C#

protected void ValidateDDL(DropDownList ddl)
        {
            if (ddl.SelectedIndex == -1) //Customize index value 
            {
                //Throw your error here
            }
        }
Function Call:

ValidateDDL(Dropdownlist1);
ValidateDDL(Dropdownlist2);
ValidateDDL(Dropdownlist3);

Same can also validate using Javascript, it depends on you...

C#

function validate()
{
   if(document.getElementById("ddlList").value == "")
   {
      alert("Please select value"); // prompt user
      document.getElementById("ddlList").focus(); //set focus back to control
      return false;
   }
}

Hope this helps you a bit.

Regards,
RK

prashant patil 4987 · Answer 2 · 2013-11-12T18:19:00

Solution 2

Check out this..
This will help you.
Link 1 [^]
Link 2 [^]

Posted 12-Nov-13 18:19pm

prashant patil 4987

Updated 12-Nov-13 18:35pm

v2