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How to get SelectedIndex from a submitted checkbox in WebForms C# .net

I have the following input in a form

<input id="ContentPlaceHolder_CBMemberType_3" type="checkbox" name="ctl00$ContentPlaceHolder$CBMemberType$3" value="SEASON">

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In my .cs file, to access the selected items, I do a foreach loop like so:

foreach (ListItem item in CBMemberType.Items)

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I can add the text associated with the checkbox to a list in the following code:

            {
                if (item.Selected)
                {

                    string Member_Descr = item.Text;

                    if (Member_Descr == "Active Military/Deferral") { Member_Descr = "ACTMIL"; }
                    if (Member_Descr == "Active Member") { Member_Descr = "REGULAR"; }
                    if (Member_Descr == "Season Off") { Member_Descr = "SEASOFF"; }
                    if (Member_Descr == "Seasonal On") { Member_Descr = "SEASON"; }
                    if (Member_Descr == "Service Fee Member") { Member_Descr = "SERVICE_FEE"; }
                    if (Member_Descr == "Special Retired Affiliate") { Member_Descr = "SPEC_RET"; }

                    MemberType = MemberType + "'" + Member_Descr + "',";
                    MemberTypeP = MemberTypeP + Member_Descr + ",";

                    if (itemFilter.Contains("Member Type") == false) { itemFilter.Add("Member Type"); itemFilterID.Add("0"); }
                    itemFilter.Add(item.Text);
             
                    
                }
            }

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But I also want to add the SelectedIndex to another list. but I can't access the index using "item.SelectedIndex", when I debug "CBMemberType", I can see an int with the "SelectedIndex" I need but I can't get it in my code. What am I missing? I'm a bit new to C# and web forms so any help would be greatly appreciated.

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Rodrigo Munera

ASKER

Thanks! I ended up just creating a counter in each "foreach" loop and iterating through it. It gave me the index in the same order as the item was being passed so that helped me match the selected value to the selected index.

Just in case you're curious, I was dealing with a list of members, and the functionality had to do with how to filter that list based on specific criteria. The list is usually hidden, but the values the list is being filtered by is visible, I wanted the user to be able to remove an item from the list, and the form would automatically submit, so I needed to be able to map the item's ID based on what the current set of filters were applied to the list. I would've done this differently but I'm working with another developer's code. Someone who is very fond of using <input type="submit" /> buttons for everything (links, headers, labels, divs). But that's another story altogether.