I found a solution on this site: http://www.gorancic.com/blog/net/c-paypal-donate-button :
private void btnDonate_Click(object sender, System.EventArgs e) { string url = ""; string business = " my@paypalemail.com "; // your paypal email string description = "Donation"; // '%20' represents a space. remember HTML! string country = "AU"; // AU, US, etc. string currency = "AUD"; // AUD, USD, etc. url += "https://www.paypal.com/cgi-bin/webscr" + "?cmd=" + "_donations" + "&business=" + business + "&lc=" + country + "&item_name=" + description + "¤cy_code=" + currency + "&bn=" + "PP%2dDonationsBF"; System.Diagnostics.Process.Start(url); }
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