generate token by passing private key and jsonstring

string privateKey = "65e365bd06f7f54a5282a63278bb21c2";

string jsonData = {\"UserID\":\"1\",\"UserName\":\"Ayyappa\",\"txnId\":\"123456\",\"customerMob\":\"8569896857\",\"lname\":\"lakshman\",\"name\":\"Balasubbiramani\",\"mname\":\"ram\",\"productCode\":\"DMT\",\"address\":\"Mumbai\",\"dateOfBirth\":\"05/10/1982\",\"agentId\":\"CUSTOMER123456\",\"partnerId\":\"761\",\"kycStatus\":\"0\",\"pancardStatus\":\"0\",\"identityDocType\":\"0\",\"identityDocNo\":\"BgQkkDr14...\",\"channel\":\"4\",\"isOTPValidated\":\"0\",\"hashKey\":\"b2b7e6c8f6f011e2b6396c4d36d4ecd6\"}";
public string SignedToken(string privateKey, string data)
        {
               byte[] privateKeyBytes = HexStringToByteArrays(privateKey);
                using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
                {
                    RSAParameters privateKeyParams = rsa.ExportParameters(true);
                    privateKeyParams.D = privateKeyBytes;
                    rsa.ImportParameters(privateKeyParams);

                    byte[] dataBytes = Encoding.UTF8.GetBytes(data);
                    byte[] signatureBytes = rsa.SignData(dataBytes, HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1);
                    string signedString = Convert.ToBase64String(signatureBytes);
                    return signedString;
                }
            
        }

        private byte[] HexStringToByteArrays(string hex)
        {
            int length = hex.Length;
            byte[] bytes = new byte[length / 2];
            for (int i = 0; i < length; i += 2)
            {
                bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
            }
            return bytes;
        } 

This is my code

I am getting Bad data Error 

getting the above Error please give me solution

using System;
using System.Security.Cryptography;
using System.Text;

public class TokenGenerator
{
    private static string privateKey = "65e365bd06f7f54a5282a63278bb21c2";
    private static string jsonString = "{\"UserID\":\"1\",\"UserName\":\"Ayyappa\",\"txnId\":\"123456\",\"customerMob\":\"8569896857\",\"lname\":\"lakshman\",\"name\":\"Balasubbiramani\",\"mname\":\"ram\",\"productCode\":\"DMT\",\"address\":\"Mumbai\",\"dateOfBirth\":\"05/10/1982\",\"agentId\":\"CUSTOMER123456\",\"partnerId\":\"761\",\"kycStatus\":\"0\",\"pancardStatus\":\"0\",\"identityDocType\":\"0\",\"identityDocNo\":\"BgQkkDr14...\",\"channel\":\"4\",\"isOTPValidated\":\"0\",\"hashKey\":\"9f3f9eb0451e8c2e3955551c57458072\"}";

    public static string GenerateToken()
    {
        // Convert private key to byte array
        byte[] privateKeyBytes = Encoding.UTF8.GetBytes(privateKey);

        // Convert JSON string to byte array
        byte[] jsonBytes = Encoding.UTF8.GetBytes(jsonString);

        // Create SHA1 with RSA crypto service provider
        using (SHA1Managed sha1 = new SHA1Managed())
        {
            // Hash the private key bytes
            byte[] hashedPrivateKey = sha1.ComputeHash(privateKeyBytes);

            // Create RSA provider with the hashed private key
            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
            {
                rsa.ImportCspBlob(hashedPrivateKey);

                // Encrypt the JSON bytes using RSA
                byte[] encryptedBytes = rsa.Encrypt(jsonBytes, false);

                // Convert the encrypted bytes to a string representation
                string encryptedToken = Convert.ToBase64String(encryptedBytes);

                return encryptedToken;
            }
        }
    }
}

// Usage
string token = TokenGenerator.GenerateToken();