Create Password Protected Zip containing a Single File.

Download Chilkat .NET for 4.0 Framework

Download Chilkat .NET for 64-bit 4.0 Framework (x64)

Download Chilkat .NET for 2.0 / 3.5 Framework

Download Chilkat .NET for 64-bit 2.0 / 3.5 Framework (x64)

Download Chilkat .NET for 1.0 / 1.1 Framework

Create a password-protected .zip containing a single file. (This uses the older Zip 2.0 encryption scheme, which is weaker and not as secure as AES encryption, which Chilkat Zip also supports.)

Chilkat.Zip zip = new Chilkat.Zip();

bool success;

//  Any string unlocks the component for the 1st 30-days.
success = zip.UnlockComponent("Anything for 30-day trial");
if (success != true) {
    MessageBox.Show(zip.LastErrorText);
    return;
}

success = zip.NewZip("test.zip");
if (success != true) {
    MessageBox.Show(zip.LastErrorText);
    return;
}

zip.SetPassword("secret");
zip.PasswordProtect = true;

bool saveExtraPath;
saveExtraPath = false;
success = zip.AppendOneFileOrDir("c:/temp/hamlet.xml",saveExtraPath);

success = zip.WriteZipAndClose();
if (success != true) {
    MessageBox.Show(zip.LastErrorText);
    return;
}

MessageBox.Show("Zip Created!");