Further to my suggestion above to create a simple application. Create a form with two updown controls and a text box. Make sure the names match those used in the following code sample. Add the method name
to the ValueChanged event of both controls and the code below to your main form code.
private void numericUpDown_ValueChanged(object sender, EventArgs e)
if (sender == numericUpDown1)
numericUpDown2.Value = numericUpDown1.Value;
StringBuilder sb = new StringBuilder();
sb.Append(", NUD2: ");
textBox1.Text = sb.ToString();
Play around with the code and the values as necessary.