Reference a form from subform in C#.net
You're getting a null because your active form is the one you're in and it is not of type frmMain. (I think you may actually be confusing an active form for a parent form?)
There are so may ways to do this. You could make your frmMain a singleton but that's weird and ugly and not recommended of late or you could pass a reference of it to its children somehow. Here's one, simple way:
Main Form:
Main Form:
public partial class frmMain : Form
{
public frmMain()
{
InitializeComponent();
}
// Main form
private void MainFrm_Load(object sender, EventArgs e)
{
FormOrder frmO = new FormOrder(this); // pass a ref of self
frmO.Show();
}
public void Refresh()
{
// some action
}
}
Sub Form:
public partial class FormOrder : Form
{
private frmMain _parent; // create a field that refers to the parent
public FormOrder(frmMain parent) // mod the constructor
{
if (parent == null) throw new NullReferenceException("Can't be NULL!!!"); // check clause
_parent = parent; // assign the ref of the parent
InitializeComponent();
}
private void ShowForm()
{
// some action
}
private void btnCopy_Click(object sender, EventArgs e)
{
_parent.Refresh(); // make the call to parent
}
}
Thanks : Stackoverflow
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