Text Encryption In Vb.Net

encrypting-a-text-in-vbnet[^]

Hope it will help...

For this you can read the Data from file in a string var,
after this you can Encrypt this

public string EncryptData(string ClearText)
{
byte[] keyArray;
byte[] EncryptString= UTF8Encoding.UTF8.GetBytes(ClearText);

System.Configuration.AppSettingsReader settingsReader = new AppSettingsReader();

string key ="Securekey";
'Above secure key is a key that can be in config file, You can specify any key of your wish

MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
hashmd5.Clear();

TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
tdes.Key = keyArray;
tdes.Mode = CipherMode.ECB;
tdes.Padding = PaddingMode.PKCS7;

ICryptoTransform cTransform = tdes.CreateEncryptor();
byte[] resultArray = cTransform.TransformFinalBlock(EncryptString, 0, EncryptString.Length);
tdes.Clear();
return Convert.ToBase64String(resultArray, 0, resultArray.Length);
}

With this above method you can encrypt data.
I hope its clear for you to implement this