How to display the Error Message in Asp.Net Page using C#?

Question

I have a couple of dropdown boxex in my aspx page and i have search button also.

if the user clicks the "search" button without selecting any of the dropdown box, i want to display message like "Please select any Value"

My Page is created dynamically, all the controls are dynamically created. and i dont want to display the error message using any of the static aspx page controls like (Text Box, label or etc...)

and I want to display the error message from some other .cs file which i am referring in my aspx.cs file.

I have tried like the below: However it is not working.

if (first!= "-- Select The Item --" || second != "-- Select The Item --")
            {
                //Do Something
            }
            else
            {

                throw new Exception("Please select any Filter Type");
            }

Community · Accepted Answer · 2017-05-23 10:24:41Z

1

You can use RequiredFieldValidator Please check below SO link:

How to add a RequiredFieldValidator to DropDownList control?

edited May 23, 2017 at 10:24

CommunityBot

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answered Sep 10, 2012 at 8:09

Lajja Thaker

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1 Comment

Jey Over a year ago

i need like say for ex: string a = "hi" if(a !=""){//do} else {show some message in the page} but am checking these thing my one my common .cs file, not in aspx.cs file

Curtis · Accepted Answer · 2012-09-10 08:15:06Z

0

Assuming dd1 and dd2 are DropDownList control IDs, you could check the SelectedIndex property:

if (dd1.SelectedIndex != 0 || dd2.SelectedIndex != 0)
{
    //Do Something
}
else
{

    throw new Exception("Please select any Filter Type");
}

answered Sep 10, 2012 at 8:15

Curtis

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1 Comment

Jey Over a year ago

i need like say for ex: string a = "hi" if(a !=""){//do} else {show some message in the page} but am checking these thing my one my common .cs file, not in aspx.cs file

Community · Accepted Answer · 2017-05-23 10:24:41Z

0

Well javascript can be used to validate the drop down list....have a look at the link below How to validate dynamically created control?

edited May 23, 2017 at 10:24

CommunityBot

11 silver badge

answered Sep 10, 2012 at 8:27

iJade

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