Want to know the volume of a rectangle prism

Well I’ve manged to work it out its a pretty simple maths equation Length x Width x Height. Lets start with the design of how this should be presented, well I’m work on Windows Form Applications so it should be in a Form, should have 3 text boxes that the user enters 3 values in one for length one for width one for height. Then once that’s sorted then need a button that makes the calculation happen, whilst we are at it may as well make a spot for where the answer is spat out to.
VolumeCalculator.PNG

With how simple the math seems it should be pretty straight forward to code, I manage to get rather stuck on when trying converting Text Boxes to Integers.

How I managed to do this:

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public void BtnCalculate_Click(object sender, EventArgs e)
        {
            //LenghtxWidthxHeight
            int Length;
            int Width;
            int Height;
            int Answer;

            Length = int.Parse(TxtBLength.Text); //converts TextBox .Text's to Interger from String
            Width = int.Parse(TxtBWidth.Text);
            Height = int.Parse(TxtBHeight.Text);

            Answer = Length * Width * Height;
            TxtBAnswer.Text = (Answer.ToString());
        }

PrismCalculated.PNG