Select All Option with Checked Combobox For WInForm C#

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In my windows application, I have combobox with check box option by following Code Project Article.

A-ComboBox-with-a-CheckedListBox-as-a-Dropdown

Its working fine but client needs like there should be Select All option in that Check box, If i select Select All option in combobox all check box items should be checked.

I have tried with ccb_ItemCheck event but not worked.

private void ccb_ItemCheck(object sender, ItemCheckEventArgs e) 
{}

Please help me to complete this operation.

Thanks in advance

Posted 9-Oct-14 6:08am

VigneshKumar957

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CHill60 9-Oct-14 12:10pm

You need to post the code you tried for us to work out why it didn't work

ZurdoDev 9-Oct-14 12:11pm

Where are you stuck?

[no name] 9-Oct-14 12:11pm

What does "but not worked" mean exactly?

2 solutions

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BillWoodruff · Answer 1 · 2014-10-09T07:08:00

I'd advise you not to use the solution in the link in production code: the architecture is seriously flawed; it uses a Form as an internal part of a Control that inherits from ComboBox which is like shooting a mouse with a cannon.

If you have to use that code, then why not just put another item in the ListView ... at the top, or the bottom ...

Assuming you start off with some items unchecked, that item reads "Check All," and, if you check it, all items are checked, and the text changes to "Uncheck All" or "Clear."

Monitor the user's selection/check/uncheck activity: the moment any item ... but this special item ... is unchecked change uncheck the special item and change its text to "Check All," and so forth.

I suggest you build your own composite UserControl which will combine a ComboBox and a ListView. It's not that difficult to do. And, if you make your own UserControl, you can add a Button to it to perform a check-all or uncheck-all function, if that's what you really want.

Member 12088223 · Answer 2 · 2015-11-09T01:27:00

Following code will be definetly work.........

On itemcheck event type following code
cmbMOPTypeADV is the control ID of checkedcombobox

private void cmbMOPTypeADV_ItemCheck(object sender, ItemCheckEventArgs e)
{
string objsender = ((System.Windows.Forms.ListBox)(sender)).Text;
int count = cmbMOPTypeADV.CheckedIndices.Count;
if (e.NewValue == CheckState.Checked)
{
count = count + 1;
}
if (objsender.ToLower() == "all" && e.NewValue == CheckState.Unchecked)
{
cmbMOPTypeADV.ItemCheck -= new System.Windows.Forms.ItemCheckEventHandler(this.cmbMOPTypeADV_ItemCheck);
UncheckedAll(cmbMOPTypeADV);
cmbMOPTypeADV.ItemCheck += new System.Windows.Forms.ItemCheckEventHandler(this.cmbMOPTypeADV_ItemCheck);
}
else if (objsender.ToLower() == "all" && e.NewValue == CheckState.Checked)
{
cmbMOPTypeADV.ItemCheck -= new System.Windows.Forms.ItemCheckEventHandler(this.cmbMOPTypeADV_ItemCheck);
CheckedAll(cmbMOPTypeADV);
cmbMOPTypeADV.ItemCheck += new System.Windows.Forms.ItemCheckEventHandler(this.cmbMOPTypeADV_ItemCheck);
}
else if ((objsender.ToLower() != "" && objsender.ToLower() != "all") && e.NewValue == CheckState.Unchecked)
{
this.cmbMOPTypeADV.ItemCheck -= new System.Windows.Forms.ItemCheckEventHandler(this.cmbMOPTypeADV_ItemCheck);
cmbMOPTypeADV.SetItemChecked(0, false);
this.cmbMOPTypeADV.ItemCheck += new System.Windows.Forms.ItemCheckEventHandler(this.cmbMOPTypeADV_ItemCheck);
}
else if ((objsender.ToLower() != "" && objsender.ToLower() != "all") && count == (cmbMOPTypeADV.Items.Count - 1))
{
cmbMOPTypeADV.ItemCheck -= new System.Windows.Forms.ItemCheckEventHandler(this.cmbMOPTypeADV_ItemCheck);
cmbMOPTypeADV.SetItemChecked(0, true);
cmbMOPTypeADV.ItemCheck += new System.Windows.Forms.ItemCheckEventHandler(this.cmbMOPTypeADV_ItemCheck);
}
}

Implement following two methods
public void CheckedAll(CheckedComboBox objCombo)
{
for (int i = 0; i < objCombo.Items.Count; i++)
{
objCombo.SetItemChecked(i, true);
}
}

public void UncheckedAll(CheckedComboBox objCombo)
{
for (int i = 0; i < objCombo.Items.Count; i++)
{
objCombo.SetItemChecked(i, false);
}
}

Select All Option with Checked Combobox For WInForm C#

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