Implementing PayPal payment on my website

I'm using visual studio to make my website. I'm having difficulties on how to set the price of the item to a specific given number.

Here is the code for the aspx.cs file:

protected void btnPurchaseExamQuestions_Click(object sender, EventArgs e)
    {
        decimal postagePackingCost = 3.95m;
        decimal examPaperPrice = 10.00m;
        int quantityOfExamPapers = int.Parse(ddlExamQuantity.SelectedValue);
        decimal subtotal = (quantityOfExamPapers * examPaperPrice);
        decimal total = subtotal + postagePackingCost;

As you can see, decimal examPaperPrice = 10.00m; is set to 10.00m. Which means when ever I click the submit button it will always be £10 total price.

I want it to get its value from an SQL data source but I have no idea what to write. Of course decimal isnt the correct code as that would only look for an integer.

My database has got a "Cost" column and this is how I call it using a repeater that is linked to an SQL data source:

<span class="prDes">£<%# Eval("Cost") %></span></td>

This will show the cost of the item based on the ID I chose. So IF I pick item 1 it will result £30.

But again, if I want to set the paypal cost to the cost of an specific item in my database how can I do that? Thanks.

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