how to add extra item in comb box in win form

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I want to know that how to add extra item in combo box with datasource?

My code is

C#

public Fill(List<string> contractor)
       {
          comboBox1.Sorted = true;
          contractor.Insert(0, "All");


           comboBox1.DataSource = contractor;



       }

After adding datasource, item("All") is shown in between.
But I want to show it on top of combo box.

Posted 18-Nov-13 19:26pm

Member 7909353

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Comments

Member 7909353 19-Nov-13 4:06am

If I modifiy after fill combo box then a warning is shown
"Additional information: Items collection cannot be modified when the DataSource property is set."

4 solutions

Solution 1

Hello ,

if you are using DataTable to bind with combobox then try this code

DataRow dr = dt.NewRow(); //dt is DataTable
dr[0] = "Please Select";//Add the item in Datarow.Here  at 0 position. you can change the position according to your requirement
dt.Rows.InsertAt(dr, 0);//add the row in datatable at top position
cmbcategory.DataSource = dt;
cmbcategory.DisplayMember = "Category";
cmbcategory.ValueMember = "Id";

thanks

Posted 18-Nov-13 20:24pm

Animesh Datta

Comments

Member 7909353 19-Nov-13 3:52am

I am using List<string> which is already filled then fill the combo box.

Animesh Datta 19-Nov-13 4:03am

Hello ,what ever you have tried previously with List<string> is working for me perfectly .
my code is same as like your code .

List<string> contractor = new List<string>();
contractor.Add("Animesh");
contractor.Add("Kriss");
contractor.Add("Madhu");
contractor.Insert(0, "Select");
cmbcategory.DataSource = contractor;

Member 7909353 19-Nov-13 4:10am

Ok!
contractor.Add("Abcd");
contractor.Add("ab");
contractor.Insert(0, "All");
cmbcategory.Sorted = true;
cmbcategory.DataSource = contractor;
It does not show item All on top of combo box

Animesh Datta 19-Nov-13 4:35am

combobox sorts alphabetically.here 'All' comes after 'ab'
thats why 'All' comes later .if you stop the sorting then output will come easily .

Solution 2

Sorted combo box always sort the list alphabetically. So set the sort to false and then insert it works perfectly.

If you want to the list to be sorted please call List.Sort before insert and then assign to data source.

Hope these helps

Posted 18-Nov-13 22:15pm

Rafeeque B Muhammad

Comments

Member 7909353 19-Nov-13 5:25am

I want combo box to be sorted and item "All" at position zero.

Solution 3

try

Datatable Dt = new Datatable();
Dt.Columns.Add("Id");
Dt.Columns.Add("Name");
Dt.Rows.Add("0","Item 1");
Dt.Rows.Add("1","Item 2");
combobox.DataSource=Dt;
combobox.ValueMember="Id";
combobox.DisplayMember="Name";

Posted 19-Nov-13 0:08am

agent_kruger

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Member 7909353 · Accepted Answer · 2013-11-19T01:11:00

It is done

C#

public Fill(List<string> contractor)
        {
contractor.Sort();
            comboBox1.Items.Insert(0, "All");
            for (int i = 0; i < contractor.Count; i++)
            {
                
                comboBox1.Items.Add(contractor[i]);
            }
           comboBox1.SelectedIndex = 0;
}</string>

but I want to know that it is better than DataSource property is set.

how to add extra item in comb box in win form

4 solutions

Solution 1

Solution 2

Solution 3

Solution 4

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