FormClosing event being called multiple times

Question

I have a combo-box to set the user culture:

If I change the Culture value x times, when the user tries to exit the FormClosing method will be fired x times.

This is my FormClosing event:

    private void FrmParent_FormClosing(object sender, FormClosingEventArgs e)
    {
        if (MessageBox.Show(this, Properties.Resources.msgExit, this.Text, MessageBoxButtons.YesNo, MessageBoxIcon.Question) == System.Windows.Forms.DialogResult.No)
            e.Cancel = true;
    }

and this is my combo-box value changed event:

    void cbCulture_ToolValueChanged(object sender, ToolEventArgs e)
    {
        ComboBoxTool cbCulture = (ComboBoxTool)sender;
        var culture = cbCulture.Value.ToString();

        FormHelpers.SetCulture(culture);

        this.Controls.Clear();
        this.InitializeComponent();
        InitForm();
    }

I have to clean and initialize the controls to change the UI to the new culture but by doing so Am I assigning the FormClosing event multiple times in InitializeComponent()? How can I avoid this behavior?

Answer 1

Its because of InitializeComponent, in that method forms design mode properties/events setted. So everytime it adds FormClosing event one more. To avoid this add this line above this.InitializeComponent();

this.FormClosing -= new System.Windows.Forms.FormClosingEventHandler(this.FrmParent_FormClosing);

Note: It solves only FormClosing event issue