If (DateTime.TryParseExact(licenseParts, 'yyyy-MM-dd', CultureInfo.InvariantCulture, DateTimeStyles.None, out licenseExpiryDate)) String licenseKeyHash = ComputeHash(licenseParts) String licenseParts = licenseData.Split(',') String licenseData = File.ReadAllText('License.key') String validLicenseKeyHash = '7E9D9CBA95CC6E842D6ECA7BC09E8A3B' // replace with your own hash value or read it from a file Check if the license key is valid and not expired Private bool ActivateLicense(string licenseKey, DateTime expiryDate) StringBuilder builder = new StringBuilder() Using (SHA256 sha256Hash = SHA256.Create())īyte bytes = sha256Hash.ComputeHash((input)) String licenseData = string.Format('', hash.Substring(0, 5), hash.Substring(5, 5), hash.Substring(10, 5), hash.Substring(15, 5)) Write the license key and expiry date to the License.key file String licenseKey = GenerateLicenseKey(username, password) ĭateTime expiryDate = (30) Generate the license key and expiry date Check if the License.key file exists, and create it if it doesn'tįileStream fileStream = File.Create(licenseFilePath) Private void btnActivate_Click(object sender, EventArgs e) MessageBox.Show('Invalid activation request file.') Private string CalculateMD5Hash(string input)īyte inputBytes = (input) īyte hashBytes = md5.ComputeHash(inputBytes) Public partial class LicenseManager : Form If you can help fix the problem I'm having i'll be s thankful! namespace License_Manager However I'm not getting any errors in my code when I click Activate button on my program all I get is a error message saying Failed to activate license. Otherwise, it will display a message indicating that the activation failed. If the activation is successful, the code will display a message indicating that the license has been activated. Finally, the code will attempt to activate the license using the generated license key and expiry date, by checking if the license key is valid and not expired. The code will then generate a license key using the provided username and password, and write the license key and expiry date to a license file. The user can select an activation request file, which contains their username and password. This code is a license manager that allows a user to activate a license key for a software product.

Gihosoft activation key