How to pass the data of my selection from SubForm to the MainForm

Question

I have two forms. MainForm and SubForm. SubForm has a combobox. Select button on MainForm and the SubForm opens. I select one of the options on the combobox click ok button and SubForm closes. I want to pass the data of my selection to the MainForm. I know this is simple but I keep messing it up somehow. Please show code with help thanks. MainForm code is string newrecordtype = null; formSubForm newSubForm = new formSubForm(newrecordtype); newSubForm.ShowDialog(); MessageBox.Show(newrecordtype.ToString()); SubForm code is public partial class FormNewRecordTypeSelection : Form { public string newrecordtype = null ; public FormNewRecordTypeSelection(newrecordtype) { InitializeComponent(); } public void buttonOK_Click( object sender EventArgs e) { object selectedIndex = comboBox1.SelectedIndex; Object selectedItem = comboBox1.SelectedItem; MessageBox .Show( Selected Item Text:  + selectedItem.ToString() + 
 + Index:  + selectedIndex.ToString()); newrecordtype = selectedItem.ToString(); }

Vulpes · Answer

I'd change your MainForm code as follows: // add this internal property to the MainForm class internal string newRecordType {get; set;} // change the code you're using to open the SubForm to this: formSubForm newSubForm = new formSubForm(this); // now passing 'this' reference newSubForm.ShowDialog(); MessageBox.Show(newrecordtype); // no need for ToString() as it's already a string Finally change the SubForm code (I'm guessing MainForm class name is 'formMainForm' but use whatever it actually is): public partial class FormNewRecordTypeSelection : Form { private formMainForm mainForm = null; public FormNewRecordTypeSelection(formMainForm mainForm) { InitializeComponent(); this.mainForm = mainForm; } public void buttonOK_Click(object sender EventArgs e) { int selectedIndex = comboBox1.SelectedIndex; object selectedItem = comboBox1.SelectedItem; MessageBox.Show(Selected Item Text:  + selectedItem.ToString() + 
 + Index:  + selectedIndex.ToString()); mainForm.newrecordtype = selectedItem.ToString(); this.Close(); // if required at this point } // ... }

kianu rieves · Answer

You could use the openargs parameter to pass data to the opened form. You would reference it in the other form with Me.OpenArgs. This works best with just one piece of data to be passed; if you need more than one piece of data you could separate them with a dilimiter and then parse it out of Me.OpenArgs. http://www.dapfor.com/en/net-suite/net-grid/tutorial/data-grouping