get a combobox value from one from to other form

Question

Hi I am stuck with one problem at passing combobox value from one FORM1 to FORM2. I wrote code in form2 like this: Form1 frm1= new Form1(); frm1.combobox1.SelectedItem; I am getting null value. How can I pass values? Thanks Darma

Jignesh Trivedi · Answer

hi If you open form2 from the form1 then you may pass combo value in constructior of form2 like.... public Form2(string value) { } private void callingFunction() { Form2 obj = new Form2(passcomboselected value); } hope this will help you.

Gopal Mahadak · Answer

make one class declare following : public static string str; then In first form take combox & load items in it.. & combox selectedValueChanged event write follwing code: Class1.str = comboBox1.SelectedItem.ToString(); & to show form2 on button write code in form1... Then in form2 load event: comboBox1.Items.Add(WindowsFormsApplication1.Class1.str); If not get check attachment

Vulpes · Answer

Try this: Form1 frm1 = (Form1)Application.OpenForms[Form1]; ComboBox cb1 = (ComboBox)frm1.Controls[comboBox1]; string value = null; if (cb1.SelectedIndex > -1) { value = cb1.SelectedItem.ToString(); }

darma teja · Answer

Hi Vulpes I am getting null error. Anyway thanks allot. It is working now with Jignesh Idea. Darma

Vulpes · Answer

Are you getting an exception or is 'value' still null? If it is null then are you sure that there is currently a selected item in the combobox?

darma teja · Answer

Hi Vulpes After changing modifier to Public also it is not working. Thanks Darma

Vulpes · Answer

If you've changed the modifier to public then you'll be able to access it directly without going through the Controls collection: Form1 frm1 = (Form1)Application.OpenForms[Form1]; string value = null; if (frm1.comboBox1.SelectedIndex > -1) { value = frm1.comboBox1.SelectedItem.ToString(); }

darma teja · Answer

Hi Vulpes you are right. It applies in 2nd point. The combobox hasn't been placed directly on the form but is inside some container such as a panel or groupbox. Actually it is in TAB and groupbox. But I changed those two controls modifiers as public Thanks Darma

Vulpes · Answer

That suggests one of the following: 1. The exact name of the combobox isn't comboBox1; or 2. The combobox hasn't been placed directly on the form but is inside some container such as a panel or groupbox. Does either of these ring a bell?

darma teja · Answer

Hi Vulpes Thanks for the reply. I am getting error at: ComboBox cb1 = (ComboBox)frm1.Controls[comboBox1]; this is the error: Object reference not set to an instance of an object. Thanks Darma