Question

I am working on C# winforms.

I have function Validate() which is present in the CS file. When I call function Validate() it opens ErrorForm using

ErrorForm ew = new ErrorForm(Errors); // Errors is list<string>
ew.Show();

But when I call it again, a new window opens and my previous window is open too. I have to close that window manually.

Is there any method available such that if I call validate() again, it will close the current ErrorForm and will open new ErrorForm.

Answer 1

try this one:

var f1=Application.OpenForms["ErrorForm"];       
if(f1!=null) 
  f1.Close(); 

f1=  new ErrorForm(Errors);
f1.Show();