Multiple drop down's with the same string values. When one drop item is selected the other items should dissappear

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ASP.NET

<asp:DropDownList ID="DropDownList1" runat="server" Width="150px" style="padding:0" Visible="True">
        </asp:DropDownList><asp:DropDownList ID="DropDownList2" runat="server" Width="150px"  style="padding:0" Visible="True">
        </asp:DropDownList><asp:DropDownList ID="DropDownList3" runat="server" Width="150px"  style="padding:0" Visible="True">
        </asp:DropDownList>

My Code to add items to the dropdownlists are below. However, i wanted to know how i can make sure when one item from below dropdown is selected it dissappears from the other drop downs. I want to do this without a button. what kind of event will i have to use? THANK YOU SO MUCH IN ADVANCE!

C#

DropDownList1.Items.Add("")
DropDownList1.Items.Add("Test1")
DropDownList1.Items.Add("Test2")
DropDownList1.Items.Add("Test3")
DropDownList1.Items.Add("Test4")
DropDownList2.Items.Add("")
DropDownList2.Items.Add("Test1")
DropDownList2.Items.Add("Test2")
DropDownList2.Items.Add("Test3")
DropDownList2.Items.Add("Test4")
DropDownList3.Items.Add("")
DropDownList3.Items.Add("Test1")
DropDownList3.Items.Add("Test2")
DropDownList3.Items.Add("Test3")
DropDownList3.Items.Add("Test4")
DropDownList4.Items.Add("")
DropDownList4.Items.Add("Test1")
DropDownList4.Items.Add("Test2")
DropDownList4.Items.Add("Test3")
DropDownList4.Items.Add("Test4")

Therefore, if "Test1" is selected from dropdownlist1. i want it to dissappear on the other dropdowns!
Thank You

What I have tried:

Pre-render didn't work :( Not sure what to do

Posted 4-Nov-16 8:04am

JT1992

Updated 4-Nov-16 19:05pm

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Comments

j snooze 4-Nov-16 15:39pm

This should do the trick(syntax may not be spot on). Use it on the selected index change event of a drop down.

DropDownListX.Items.Remove(DropDownListX.Items.FindByValue("Test1"));

DropDownListX.Items.Remove(DropDownListX.Items.FindByValue(DropDownListX.SelectedItem.Text));

JT1992 4-Nov-16 15:41pm

where can i add this in as an event? i have no buttons to do this. and it needs to happen dynamically.

JT1992 7-Nov-16 14:27pm

What would i do if the user selects item Test1 and then unselects item Test1. how can i add it back into the list for the other drop downs if the user unselects item Test1 in dropdownlist1?

JT1992 9-Nov-16 10:26am

aything???

JT1992 9-Nov-16 10:26am

can you check my comment please thanks

j snooze 4-Nov-16 17:57pm

dropdownlists have events too, not just buttons. You can either double click on the dropdown on your design screen or add it on the <asp:DropDownList> xhtml item. there should be a selectedindex change event in there somewhere....there are more than just the selectindex changed event, but thats the one you want for when someone selects something.

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pparya27 · Accepted Answer · 2016-11-04T19:05:00

Here is a sample code for your requirement, you can modify it as per your requirement -