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how to remove duplicate items in dropdown list?

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Sunday, March 29, 2009 4:15 AM

Mantissa Corporation 35 Points

I have a dropdown list column on a datagridview that is bound to a datasource with values like this

1

1

2

2

3

3

etc...

And this is how they show up in my list. I only want the values 1-10 showing but I only want one of each

number. I am sure i can handle it in the cellformatting event I am just not sure how

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Sunday, March 29, 2009 3:39 PM

35,075 Points

Why don't you make a slight change in your SQL Statement to include the DISTINCT keyword?

Can we see the code where you are performing the binding? I am assuming you are binding

something from a Database table.

John Grove - TFD Group, Senior Software Engineer, EI Division, http://www.tfdg.com

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Sunday, March 29, 2009 3:39 PM

35,075 Points

Why don't you make a slight change in your SQL Statement to include the DISTINCT keyword?

Can we see the code where you are performing the binding? I am assuming you are binding

something from a Database table.

John Grove - TFD Group, Senior Software Engineer, EI Division, http://www.tfdg.com

Windows Forms Data Controls and Databinding

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7/21/2019 How to Remove Duplicate Items in Dropdown List

http://slidepdf.com/reader/full/how-to-remove-duplicate-items-in-dropdown-list 2/2

7/10/13 how to remove duplicate items in dropdown list?

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Monday, March 30, 2009 2:18 AM

Mantissa Corporation 35 Points

I suppose that would be an option.

I actually ran into a bigger issue with the dropdown list. Each time I selected a value instead of 

changing the current cell it jumped me to another cell in the same column. No clue what is happening

there.

So, because of that behavior I have switched back to textbox column for now. I will try your suggestion

and then hopefully i won't have that issue again with the selected value.

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Friday, July 29, 2011 7:08 AM

15 Points

 void RemoveDuplicateItems(DropDownList ddl)

{

  for (int i = 0; i < ddl.Items.Count; i++)

{

ddl.SelectedIndex = i;

  string str = ddl.SelectedItem.ToString();

  for (int counter = i + 1; counter < ddl.Items.Count; counter++)

{ddl.SelectedIndex = counter;

  string compareStr = ddl.SelectedItem.ToString();

  if (str == compareStr)

{

ddl.Items.RemoveAt(counter);

counter = counter - 1;

}

}

}

}

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Ashish Tripathi