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2 combo boxes populated with 1 array, remove vaule from combo 2 if its selected in combo1

Posted on 2011-09-08
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Last Modified: 2013-12-17
I have 2 combo boxes on a form for approvals.  I have 1 array loading the names of everyone from 2 sepeate binding sources as you can see in the code below.  Everything works fine, except when I try to remove the item from the second box if its been selected in the first.

string[] approvers = { "Person 1", "Person2", "Parson3", "Person4" };
BindingSource source1 = new BindingSource();
BindingSource source2 = new BindingSource();
source1.DataSource = approvers;
cmbFirstApprover.DataSource = source1;
source2.DataSource = approvers;
cmbSecondApprover.DataSource = source2;
        
private void cmbFirstApprover_SelectedIndexChanged(object sender, EventArgs e)
        {
            //Remove person from second combo
            string firstApprover = cmbFirstApprover.Text;

             //source2.Remove(firstApprover);

             //cmbSecondApprover.Items.Remove(firstApprover);
          }

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source2.Remove(firstApprover);
This generats the error below when the approval form loads, even though its in the selectedIndexChanged    
NotSupportedException was unhandled by user code
Collection was of a fixed size  

This generates the error below when I make a selection on the first combo box.
ArgumentException was unhandled
Items collection cannot be modified when the DataSource property is set.
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Question by:dustock
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12 Comments
 
LVL 28

Expert Comment

by:strickdd
ID: 36504576
As the error says, you can't remove items when a combo box is bound to a data source. You will have to manually add the items.

string[] approvers = { "Person 1", "Person2", "Parson3", "Person4" };

foreach(string approver in approvers)
{
    cmdFirstApprover.Items.Add(new ListItem(approver));
    cmbSecondApprover.Items.Add(new ListItem(approver));
}

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LVL 9

Author Comment

by:dustock
ID: 36504691
strickdd, all this does for me is get rid of the error messages.  It doest remove the item from the second combo box.  My code to display it worked, its my code to remove the item that's not working.

Thanks,

Dustin
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LVL 28

Expert Comment

by:strickdd
ID: 36504748
Did you add back in the code to remove the item from the combo box when the first one is selected?
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LVL 9

Author Comment

by:dustock
ID: 36505118
I sure did, it didnt do anything.
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LVL 28

Expert Comment

by:strickdd
ID: 36505280
Can you post your code?
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LVL 9

Author Comment

by:dustock
ID: 36505355
I tried both ways to remove again, neither one does anything.

private void TE_IIDB_APPROVAL_Load(object sender, EventArgs e)
{
string[] approvers = { "Person 1", "Person2", "Parson3", "Person4" };

foreach (string approver in approvers)
{
     cmbFirstApprover.Items.Add(new ListItem(approver));
     cmbSecondApprover.Items.Add(new ListItem(approver));
}
}

private void cmbFirstApprover_SelectedIndexChanged(object sender, EventArgs e)
{
     string firstApprover = cmbFirstApprover.Text;
            
      if (cmbFirstApprover.Text != "")
      {
         source2.Remove(firstApprover);
         //cmbSecondApprover.Items.Remove(firstApprover);
       }
}

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0
 
LVL 28

Expert Comment

by:strickdd
ID: 36505382
You're no longer using source2 because you are manually binding the information. Just remove the item from the cmbSecondApprover:

private void cmbFirstApprover_SelectedIndexChanged(object sender, EventArgs e)
{
     string firstApprover = cmbFirstApprover.Text;
            
      if (cmbFirstApprover.Text != "")
      {
         cmbSecondApprover.Items.Remove(firstApprover);
       }
} 

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LVL 9

Author Comment

by:dustock
ID: 36505514
I tried the cmbSecondApprove.Items.Remove, and that didnt work either.
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LVL 28

Expert Comment

by:strickdd
ID: 36505570
That is interesting... the other suggestion I have would be this:

string[] approvers = { "Person 1", "Person2", "Parson3", "Person4" };

private void TE_IIDB_APPROVAL_Load(object sender, EventArgs e)
{
foreach (string approver in approvers)
{
     cmbFirstApprover.Items.Add(new ListItem(approver));
     cmbSecondApprover.Items.Add(new ListItem(approver));
}
}

private void cmbFirstApprover_SelectedIndexChanged(object sender, EventArgs e)
{
     string firstApprover = cmbFirstApprover.Text;
            
      if (cmbFirstApprover.Text != "")
      {
           cmdSecondApprover.Items.Clear();

           foreach (string approver in approvers)
{
if(approver != firstApprover)
{
   cmbSecondApprover.Items.Add(new ListItem(approver));
}
}
       }
} 

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LVL 9

Author Comment

by:dustock
ID: 36506008
I'll give that a shot and update you tomorrow.  Thanks
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Accepted Solution

by:
dustock earned 0 total points
ID: 36530917
I switched my code to use List <string> approvers = new List <string>(); instead and I was able to remove the item from the list before I populate the second combobox.
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LVL 9

Author Closing Comment

by:dustock
ID: 36555812
using List <string> I was able to remove the item before populating the second combo box.
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