Encryption and decryption with linq

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C#

LINQ

DevExpress

Blazor

How to encypt and decrypt a integer value in linq and store it in varbinary(max) in sql please tell me

<pre> public string GetQCAsync(string UserLimit)
        {
            var DSet1 = _context.test.Where(x => x.Uid == 1).FirstOrDefault();

            var provider = new System.Security.Cryptography.RSACryptoServiceProvider();
            provider.ImportParameters(your_rsa_key);

            DSet1.NoOfUsers = provider.Encrypt(
                System.Text.Encoding.UTF8.GetBytes(UserLimit), true);

            string decryptedTest = System.Text.Encoding.UTF8.GetString(
                provider.Decrypt(DSet1.NoOfUsers, true));

            return decryptedTest;
        }

this is what i tried
what is

your_rsa_key

in here

What I have tried:

public string GetQCAsync(string UserLimit)
       {
           var DSet1 = _context.test.Where(x => x.Uid == 1).FirstOrDefault();

           var provider = new System.Security.Cryptography.RSACryptoServiceProvider();
           provider.ImportParameters(options);

           DSet1.NoOfUsers = provider.Encrypt(
               System.Text.Encoding.UTF8.GetBytes(UserLimit), true);

           string decryptedTest = System.Text.Encoding.UTF8.GetString(
               provider.Decrypt(DSet1.NoOfUsers, true));

           return decryptedTest;
       }