public static string GetLicenseValue()
{
string ret_license_value = string.Empty;
InputBox obj = new InputBox();
{
string filename = (Path.Combine(Environment.CurrentDirectory, @"SDKLicense.txt"));
if (File.Exists(filename))
{
using (StreamReader sr = File.OpenText(filename))
{
ret_license_value = sr.ReadLine().Trim();
}
}
else
{
string value = string.Empty;
bool loop_flag = false;
string msg = string.Empty;
DialogResult diagRes;
do
{
if (!loop_flag)
{
msg = "SDK License file not found." + Environment.NewLine + "Please enter the SDK license key.";
}
else
{
if (ret_license_value.Equals(string.Empty))
{
msg = "The textbox cannot be empty." + Environment.NewLine + "Please enter the SDK license key.";
}
else
{
msg = "The license key should be 16 characters long." + Environment.NewLine + "Please enter the correct SDK license key.";
}
}
diagRes = obj.Show(msg, ref value);
if (diagRes == DialogResult.OK)
{
loop_flag = true;
ret_license_value = value.Trim();
}
else
{
obj.FormClose();
Application.Exit();
}
}while ((ret_license_value.Equals(string.Empty)) || (ret_license_value.Length != 16));
FileStream fs = File.Open(filename, FileMode.CreateNew, FileAccess.Write);
StreamWriter sw = null;
sw = new StreamWriter(fs, System.Text.Encoding.UTF8);
sw.WriteLine(ret_license_value);
sw.Close();
}
}
return(ret_license_value);
}