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Replace ComboBox ListIndex

Posted on 2004-08-25
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Last Modified: 2008-02-01
Hey Experts,

The following code is from VB6, and it actually replace the ListIndex of a ComboBox with my table's primary Key.
Does someone knows of any way to do this in C# ?


mission.AddItem tb_mission("mission_type_name_e")
mission.ItemData(mission.NewIndex) = Val(tb_mission("mission_type_id"))

val_mission_type = combo_mission_type.ItemData(combo_mission_type.ListIndex)
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Question by:Francis_B
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Expert Comment

by:chmohan
ID: 11897011
use combobox.SelectedIndex in c#  .net
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Expert Comment

by:chmohan
ID: 11897021
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Accepted Solution

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drichards earned 500 total points
ID: 11897133
You don't do things quite the same way with a .NET ComboBox.  Instead if having strings in the list and itemData for each item, .NET puts an object in the list and uses the default string representation (ToString() method) of the object for display.  So, this means in .NET (C# in your case) you need to create a class that holds the string value and key value from the data table.  The ToString() method should return the string value.  For each item in the combobox, you create a new instance of the object and do 'comboBox1.Add(newItem);' where newItem is an object instance.   It will look something like this:

        class CBItem
        {
            public CBItem(string name, int key) { m_name = name; m_key = key; }
            public override string ToString() { return m_name; }
            public int Key() { return m_key; }

            private int m_key;
            private string m_name;

        }


Then in your code loading the combobox:

   comboBox1.Items.Add(new CBItem(<db string>, <db key>)); // replace <db name> and <db key> with appropriate values

Then to view "item data":

   int key = ((CBItem)comboBox1.Items[idx]).Key();
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