Money Credit Counter "C sharp"

Hello there I am new to C sharpe, I was wondering how to set 1pence, 2pence 5pence, 10pence, 20pence, 50pence, 1pound and 2pound into a decimal into my programming.
here is an example of my first line of code: I have made the text bigger on some part of the code I want you to have a look to see wether I should divide by / 100.

 private void pictureBox1_Click(object sender, EventArgs e)         {             if (txt_credit.Text == string.Empty)             {                 MessageBox.Show("You have set the cost of the credits");             }             else      ...