C# Calling a method from another Form

Question

Hi I have 2 Form Form1 and Form2

Form1 have a table and there is my records and there is a Void for refresh the table in the Form1.

Form2 is my insert form I

Answer 1

Adjust the construct for Form2 so it takes an extra parameter, like this:

...
private Form1 mainWindow;
public Form2(Form1 mainWindow)
{
   this.mainWindow = mainWindow;
}
...
public void HaveSavedSql()
{
   this.mainWindow.RefreshAll();
}

You should consider however looking up on Interfaces so you can seperate concerns. Interfaces are useful for many things!

Answer 2

In Form1, when you open Form2, attach to Form2 OnClose/Closed event, or a custom Save event, which when raised, refreshes the table in form 1.

Answer 3

try this to call method from another form :

if (System.Windows.Forms.Application.OpenForms["ParentFormName"] != null)
    {
        (System.Windows.Forms.Application.OpenForms["ParentFormName"] as   ParentFormName).MethodName(args);
    }

Answer 4

Form2 will have to have a reference to the instance of Form1. You can pass this reference to Form2 when the insert button is clicked:

Form2 insertForm = new Form2();
//Form2.ShowDialog(Me); - Correction - 'Me' is for VB. in C# it's:
Form2.ShowDialog(this);

Next on Form2 you can access Form1 like this:

(Form1)this.Parent.RefreshTable();