Problem when saving currency type in access database

Question

Hello,I insert currency type balue in my access database. When I press the insert button in the textbox I can see the correct value, but when I check it in the database it is an Integer, i.e. not the correct value which I inserted and which I saw in the textbox, after pressing the insert button.
Here is my code:

if (Convert.ToInt32(textBox10.Text) >= 12)
            {

                if (Convert.ToInt32(textBox4.Text) <= 20 && Convert.ToInt32(textBox4.Text) > 1)
                {
                    label34.Text = (Decimal.Parse(textBox7.Text) * 5 / 100).ToString();
                }
                else if (Convert.ToInt32(textBox4.Text) <= 40 && Convert.ToInt32(textBox4.Text) > 21)
                {
                    label34.Text = (Decimal.Parse(textBox7.Text) * 15 / 100).ToString();
                }
                else if (Convert.ToInt32(textBox4.Text) <= 70 && Convert.ToInt32(textBox4.Text) > 41)
                {
                    label34.Text = (Decimal.Parse(textBox7.Text) * 25 / 100).ToString();
                }
                else if (Convert.ToInt32(textBox4.Text) > 71)
                {
                    label34.Text = (Decimal.Parse(textBox7.Text) * 50 / 100).ToString();
                }

            }
            else
            {
                int popust = 0;
                label34.Text = popust.ToString();
            }

            dvalue = 0;
            decimal.TryParse(label34.Text, out dvalue);
            com.Parameters.Add("@VkpopustbezDDV", OleDbType.Currency).Value = dvalue;

Can anybody help me please what is my problem? Why it is changed and not inserted like currency but int type value in the access database?

Thank you in advance