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combobox selecteditem in a textbox with a click of a button

Posted By:      Posted Date: April 14, 2011    Points: 0   Category :Windows Application

I have a Combobox and textbox (multiline) and a button, I would like in every item selected when i click the button it adds the DisplayMember text in the textbox with a comma after the the text. I would like to be able to add more than one Member in the text box, Resulting in a string like: blah, blah, blah You get the picture.

Can someone help on any idea how to write this an expalination aswel would be very welcome to understand what is done.

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