remove duplicate from combo box list

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I have populated the combo box with data from a database and I wanted to remove the duplicate names from the combo box items list. Can you give me a code to do it?

Posted 30-Jun-12 22:18pm

wolfsor

Updated 7-Dec-21 17:54pm

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4 solutions

Solution 3

As Sandeep's answer best way is select distinct when you select from database.

if you are using c# 3.0 or later you can try below code

C#

var itemArry= myComboBox.Items.SelectMany(i => i).Distinct().ToArray();
myComboBox.Items.Clear();
myComboBox.Items.AddRange(itemArry);

Posted 1-Jul-12 0:36am

DamithSL

Comments

JayantaChatterjee 11-Mar-13 8:35am

My 4 for second Best Solution..

Solution 6

Linq:
It own has the property of Distinct()

//Some data in Linq

C#

List<data> list = new List<data>()
{
    Name ="Swaraj Ambekar",
    Name ="Swaraj Ambekar",
    Name ="Swaraj Ambekar",
    Name = "Forbes Technosys"
};

//Adding data source to combobox with linq

C#

comboBox1.DataSource = list.Select(x => x.Name).Distinct().ToList();

Posted 5-Jun-20 3:57am

Member 14854584

Updated 5-Jun-20 4:00am

v3

Comments

CHill60 5-Jun-20 10:10am

Solution 3 uses Linq, specifically Distinct() - you haven't really added anything new to this 8 year old thread

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OriginalGriff · Accepted Answer · 2012-06-30T23:02:00

It's not necessarily as simple as that - it depends to an extent on what type of items you have filled your ComboBox with. Because you can't just set the Items array (it exposes no public setter, just the getter) you have to create a new array of items, remove the duplicates, and set it back into the ComboBox:

C#

List<object> list = new List<object>();
foreach (object o in myComboBox.Items)
    {
    if (!list.Contains(o))
        {
        list.Add(o);
        }
    }
myComboBox.Items.Clear();
myComboBox.Items.AddRange(list.ToArray());

Sandeep Mewara · Accepted Answer · 2012-06-30T23:21:00

Solution 2

Why not just fetch the unique ones from database itself?
Like:

SQL

SELECT DISTINCT Names FROM MstNames

If you still want to, before assigning the datasource, filter the datatable to be used.
To know more of it, read here: MSDN: DataView.RowFilter Property[^]

Posted 30-Jun-12 23:21pm

Sandeep Mewara

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JayantaChatterjee 11-Mar-13 8:34am

My 5 for Best Solution...

remove duplicate from combo box list

4 solutions

Solution 1

Solution 2

Solution 3

Solution 6

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