C#

double d;
int yourInt;
if(double.TryParse(YoureString,System.Globalization.NumberStyles.Integer, CultureInfo.CurrentCulture, out d))
{
	yourInt = Convert.ToInt32(d);
}

private void Form1_Load(object sender, EventArgs e)
{
    OpenFileDialog dlg = new OpenFileDialog();
    List<Control> loadedCtrls = new List<Control>();

    if (dlg.ShowDialog() == DialogResult.OK)
    {
        Assembly src = Assembly.LoadFile(dlg.FileName);

        Type[] types = src.GetExportedTypes();
        foreach (Type test in types)
        {
            // First test that the type is a class and that it's not an abstract class,
            // and finally that it is either Control or a subtype of Control.
            if (test.IsClass && !test.IsAbstract && typeof(Control).IsAssignableFrom(test))
            {
                // Now make sure we have an empty public constructor for
                // the CreateInstance method.
                if (test.GetConstructor(Type.EmptyTypes) != null)
                    loadedCtrls.Add((Control)src.CreateInstance(test.FullName));
            }
        }
    }

    Console.WriteLine(loadedCtrls.Count.ToString());
}

myChild frm1; //myChild is the ID of your child form<br />
frm1 = new frm1();<br />
frm1.ShowDialog(this);

((myMDI)(this.Owner)).Label1.Text = "Hi";<br />
<br />
 // myMDI is your MDI form