how can i hide and return some values on combobox

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hiiiii
how can i hide some values on combobox and after some changes, return and come back to normal values of this combobox?
help me please. i have a serious problem

Posted 10-Nov-13 23:07pm

mohsenvasefi

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CodeBlack 11-Nov-13 5:23am

can you please make your question more clear with code you have tried ?

mohsenvasefi 11-Nov-13 6:40am

if (comboBox44.SelectedIndex == 0)
{
S_DRV_Byte26 = (byte)(S_DRV_Byte26 | 0x00);
(i need to hide some value of combobox43 here and in next selection of combobox, initialize again)
}
else
{
S_DRV_Byte26 = (byte)(S_DRV_Byte26 & 0xff);
}

Richard MacCutchan 11-Nov-13 5:43am

Just rtemove the values you do not want to be shown, and then restore them when required.

mohsenvasefi 11-Nov-13 6:32am

what can i restore them? i think if i can hide them, it can help me more!

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BillWoodruff · Answer 1 · 2013-11-11T00:36:00

Solution 1

This code demonstrates adding, and restoring, the seventh Item in a WinForms ComboBox:

C#

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    if (comboBox1.Items.Contains("Item 7"))
    {
        comboBox1.Items.RemoveAt(6);
        // or use Remove("Item 7");
    }
    else
    {
        comboBox1.Items.Insert(6, "Item7");
    }
}

You'll have to store and keep track of which items you remove, and where they should be inserted when you need to restore them.

You should read the documentation on the ComboBox.ObjectCollection Class' 'Contains, 'RemoveAt, and 'Insert methods.

Posted 11-Nov-13 0:36am

BillWoodruff

Comments

mohsenvasefi 11-Nov-13 6:44am

thank you, but my problem is about two comboboxes that one of them controlled another, not itself! like below code:
if (comboBox44.SelectedIndex == 0)
{
S_DRV_Byte26 = (byte)(S_DRV_Byte26 | 0x00);
(hide some value of combobox43 here and in next selection of combobox, initialize again)
}
else
{
S_DRV_Byte26 = (byte)(S_DRV_Byte26 & 0xff);
}

BillWoodruff 11-Nov-13 6:50am

You can easily use the code shown here: just remove the Items from ComboBox43 when the user selects Item 0 in ComboBox44, and restore them when they select Item 1.

mohsenvasefi 11-Nov-13 8:39am

why my code has wrong result?

if (comboBox44.SelectedIndex == 0)
{
S_DRV_Byte26 = (byte)(S_DRV_Byte26 | 0x00);
comboBox43.Items.RemoveAt(2); comboBox43.Items.RemoveAt(2);
}
else
{
S_DRV_Byte26 = (byte)(S_DRV_Byte26 | 0x01);
S_DRV_Byte26 = (byte)(S_DRV_Byte26 & 0xff);
comboBox43.Items.RemoveAt(0); comboBox43.Items.RemoveAt(0);
comboBox43.Items.Insert(2, "AGFS");
comboBox43.Items.Insert(3, "MGFS");
}
comboBox43.Items.Insert(0, "APS");
comboBox43.Items.Insert(1, "MPS");

BillWoodruff 11-Nov-13 9:24am

Try to give as complete information as possible in your original question; without knowing what's in each of the two ComboBoxes to begin with, I'm not going to turn my head inside-out trying to imagine what's going on.

One idea: bypass this whole problem by creating two ComboBoxes of the same size, positioned at the same location, and depending on what the user selects in the first ComboBox, use 'BringToFront() to move the correct one in front of the other ... or use Hide/Show.