Format Exception_Input String was not in correct format

I am using windows forms and i am trying to get some doubles as input to do some calculations

The input is in textBox which is by default String, it needs to be converted to the type i am using,

I am doing this on the
public void textBox2_TextChanged(object sender, EventArgs e)

I have tried the followings:
double a;

a = Convert.ToDouble(textBox2.Text);
a = Double.Parse(textBox2.Text);

but both of them have a runtime error, Format Exception was unhandled
Input string was not in a correct format.

Any idea to solve the problem??


  • You need to check the value of textBox2.text at run time. If the value is string then it will not be convertible to double. so only the value(may be string value), which is convertible to double will be accepted and will give you the desired results.

    Hope it will help you in the resolving error.
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