Testing for non numeric data but must allow decimal point

[Sloth_c#]

I am trying to check for non numeric data however the user must be able to use decimal points, I have the following code so far but this does not allow decimal point, could someone advise how I would go about this please?

Thanks in advance.

// non numeric data check
            int num1;
            bool isNumeric1 = int.TryParse(txtHeight.Text, out num1);
            if (isNumeric1)
            {

            }
            else
            {
                txtHeight.Text = ("");
                MessageBox.Show("Only enter numbers into\nthe Height text field", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }

            // non numeric data check
            int num2;
            bool isNumeric2 = int.TryParse(txtWeight.Text, out num2);
            if (isNumeric2)
            {
                // convert and display conversion in appropriate textfield, call class to convert
            }
            else
            {
                txtWeight.Text = ("");
                MessageBox.Show("Only enter numbers into\nthe Weight text field", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }