if (maskedTextBox1.Text != null)
{
double money=Convert.ToDouble(maskedTextBox1.Text)+Convert.ToDouble(maskedTextBox1.Text);
textBox1.Text=money.ToString();
}
Convert the two values and add them thats it. Try it it works.
WHy double and float. Beacause money is in decimal format. for example 100.80 $. To store point value we have an data type called double. So use it. I have one more suggesion. While you declare any decimal value in program declare as
float decimal=10.9f;
Enjoy :laugh: :-D .