Hi Ehab,

The UI culture must be set (from an app.config file, or in an initialization
form) before a form displaying any localized resources is loaded .  This
allows the appropriate resources to be retrieved during the actual loading
of the localized form.

HTH,
Derrick

You should not call the InitializeComponent() directly.

InitializeComponent() will create and initizlize all controls.

You just need to reload all the resourse strings.

You can refer your InitializeComponent() function

e.g. your InitializeComponent() has

private void InitializeComponent()
{
    System.Resources.ResourceManager resources = new    
System.Resources.ResourceManager(typeof(FormXXXX));

    this.label1 = new System.Windows.Forms.Label();
    this.label1.AccessibleDescription =
((string)(resources.GetObject("label1.AccessibleDescription")));
    this.label1.AccessibleName =
((string)(resources.GetObject("label1.AccessibleName")));
......
    this.label1.Text = resources.GetString("label1.Text");
......
}

Then you can implement a function

void ReloadResource()
{
System.Resources.ResourceManager resources = new    
System.Resources.ResourceManager(typeof(FormXXXX));

    this.label1.Text = resources.GetString("label1.Text");
......
}

i.e. your function just need to reload the string with Multilanguage
localization necessary.

Then, after you set the thread CultureUI , call the ReloadResource().