c# code for combobox to set as optional value?

Question

c# code for combobox to set as optional value? I Have 3 Dev Express combo box,I need one combo box as optional how to achieve this?

My code is below:

         if (cmbEmployeeIDName.SelectedItem != null)
            {
                EmployeeId = Convert.ToInt64(cmbEmployeeIDName.SelectedItem.Value);
            }

            if (cmbCompany.SelectedItem != null)
            {
                CompanyId = Convert.ToInt64(cmbCompany.SelectedItem.Value);
            }
            if (cmbDepartment.SelectedItem != null)
            {
                DepartmentId = Convert.ToInt64(cmbDepartment.SelectedItem.Value);
            }

you can always add empty value to each combobox you like to be optional - is there smth more you want to do? — Nogard, Nov 26 '13 at 12:42
@user3036427 : you want to add some `default` text to combobox? — Sudhakar Tillapudi, Nov 26 '13 at 12:44
possible duplicate of [How to set selected value to Combobox?](http://stackoverflow.com/questions/6688157/how-to-set-selected-value-to-combobox) — Monika, Nov 26 '13 at 12:45
how to use in else if condition need to check in null also not null? — user3036427, Nov 26 '13 at 12:47

Sudhakar Tillapudi · Answer 1 · 2013-11-26T12:53:02.287

0

you can compare with empty string

Try this:

if (cmbEmployeeIDName.SelectedItem !=null && cmbEmployeeIDName.SelectedItem.Value.Trim() != "")
{
    EmployeeId = Convert.ToInt64(cmbEmployeeIDName.SelectedItem.Value);
}

edited Nov 26 '13 at 12:53

answered Nov 26 '13 at 12:45

Sudhakar Tillapudi

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i want use as optional whether it is null or not null? – user3036427 Nov 26 '13 at 12:49
Trim() throwing Error. – user3036427 Nov 26 '13 at 12:52
Thank you for your reply Mr.Nogard gave correct one without using Trim(). – user3036427 Nov 26 '13 at 12:58

Nogard · Accepted Answer · 2013-11-26T12:59:43.483

0

First you need to add default value to your Combobox like this

comboBox.Items.Add(" ");

Then, when you check for assignment:

if (comboBox.SelectedItem != null && comboBox.SelectedItem.Value != " ")
            {
                comboBoxId = Convert.ToInt64(comboBox1.SelectedItem.Value);
            }

And change comboBox to desired comboBox name.

Of course you can change " " for every string you like - just be sure it is unique from real choices

edited Nov 26 '13 at 12:59

answered Nov 26 '13 at 12:53

Nogard

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Any condition need to be used between this. – user3036427 Nov 26 '13 at 12:57
yep, my fault - fixed samle, change `combobox` to the one that should be optional – Nogard Nov 26 '13 at 13:00
please be more precise - what exactly isn't working? any errors? – Nogard Nov 26 '13 at 13:23

c# code for combobox to set as optional value?

2 Answers2