Created a container object to house messages, operation status and the rows added for the methods that add new items and update existing items in the database.

AdvertsingProfitControl/DbWriterStatus.cs

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+using System.Collections.Generic;
+
+namespace AdvertsingProfitControl
+{
+    internal class DbWriterStatus
+    {
+        //Initialize the _status to failed just to have it not be null.
+        private WritingOperationStatus _status = WritingOperationStatus.Failed;
+        private readonly Dictionary<int, int> _rowIds;
+        private string _errorMessage;
+
+        public DbWriterStatus()
+        {
+            _rowIds = new Dictionary<int, int>();
+        }
+
+        public void SetStatus(WritingOperationStatus status)
+        {
+            _status = status;
+        }
+        /// <summary>
+        /// Gets the status from the operation.
+        /// </summary>
+        /// <returns>A status indicating whether or not it was successful, default is failed.</returns>
+        public WritingOperationStatus GetWritingOperationStatus()
+        {
+            return _status;
+        }
+        /// <summary>
+        /// Adds a row to the Rows Dictionary that keeps track of what rows have been
+        /// added to the database including their IDs.
+        /// </summary>
+        /// <param name="key">The index of the row that was added to the database.</param>
+        /// <param name="rowIdNumber">The ID number of the row as represented in the database.</param>
+        public void AddRowId(int key, int rowIdNumber)
+        {
+            _rowIds.Add(key, rowIdNumber);
+        }
+        /// <summary>
+        /// Removes a row from the Rows collection.
+        /// </summary>
+        /// <param name="key">The row's index that is to be deleted.</param>
+        public void DeleteRow(int key)
+        {
+            _rowIds.Remove(key);
+        }
+
+        public void ClearRowCollection()
+        {
+            _rowIds.Clear();
+        }
+        /// <summary>
+        /// Gets the Dictionary containing rows that have been added to the database.
+        /// The keys are the row's index and the value is the row's ID as represented 
+        /// in the database.
+        /// Returns an empty Dictionary if no rows have been added.
+        /// </summary>
+        /// <returns>The rows that have been added to the database.</returns>
+        public Dictionary<int, int> GetRowCollection()
+        {
+            return _rowIds ?? new Dictionary<int, int>();
+        }
+        /// <summary>
+        /// Sets an error message.
+        /// </summary>
+        /// <param name="message">The error message to be set.</param>
+        public void SetErrorMessage(string message)
+        {
+            _errorMessage = message;
+        }
+        /// <summary>
+        /// Gets any error message set by the Insertion/Update operation function.
+        /// If none are set returns an empty string.
+        /// </summary>
+        /// <returns>The error message.</returns>
+        public string GetErrorMessage()
+        {
+            //If the error message is null then return string.Empty.
+            //Otherwise return the error message.
+            return _errorMessage ?? string.Empty;
+        }
+    }
+
+    /// <summary>
+    /// Operation status emus to keep things consistent.
+    /// </summary>
+    public enum WritingOperationStatus
+    {
+        Failed = 0,
+        InsertionSuccessful = 1,
+        UpdateSuccessful = 2
+    }
+}