Exception handling using NLog Tool

Hi Everyone,

I am using below static method to log the exceptions into DataBase in my ASP.net application.
But now i want to have the logging by using NLog tool. Can anyone guide me through this one. I am not getting any way to solve it and stuck up completely.

 public static class EventLogger
    {
        const string insertException = "dbo.InsertExceptionsLog";
        string connString = "";

        public void InsertException(string source, string systemName, string exceptionDetails, DateTime timeGenerated, string userName)
        {             
            using (SqlConnection conn = new SqlConnection(connString))
            {
                try
                {
                    conn.Open();
                    using (SqlTransaction tran = conn.BeginTransaction())
                    {  
                        try 
                        {
            
                SqlParameter[] parms = new SqlParameter[6];
                
                parms[0] = new SqlParameter("@Source", SqlDbType.VarChar);
                parms[0].Value = source;

                parms[1] = new SqlParameter("@SystemName", SqlDbType.VarChar);
                parms[1].Value = systemName;

                parms[2] = new SqlParameter("@ExceptionDetails", SqlDbType.Text);
                parms[2].Value = exceptionDetails;

                parms[3] = new SqlParameter("@TimeGenerated", SqlDbType.DateTime);
                parms[3].Value = timeGenerated;

                parms[4] = new SqlParameter("@TimeWritten", SqlDbType.DateTime);
                parms[4].Value = DateTime.Now; // timeWritten;

                parms[5] = new SqlParameter("@UserName", SqlDbType.VarChar);
                parms[5].Value = userName;

                SqlHelper.ExecuteNonQuery(tran, CommandType.StoredProcedure, "InsertExceptionsLog", parms);
                tran.Commit();  
                        }

                       catch (Exception ex)
                        {
                           tran.Rollback();
                            throw (ex);
                        }   
                    }
                    
                }            
                catch (Exception ex)
                {
                    throw (ex);
                }                
            
        }

    }

}

My database table is

SELECT [ExceptionID]
      ,[Source]
      ,[SystemName]
      ,[ExceptionDetails]
      ,[TimeGenerated]
      ,[TimeWritten]
      ,[UserName]
  FROM [CPS_CL_Application_Exception].[dbo].[ExceptionDetails]
order by [ExceptionID] desc

My stored Procedure is

SELECT [ExceptionID]
      ,[Source]
      ,[SystemName]
      ,[ExceptionDetails]
      ,[TimeGenerated]
      ,[TimeWritten]
      ,[UserName]
  FROM [CPS_CL_Application_Exception].[dbo].[ExceptionDetails]
order by [ExceptionID] desc