diff --git a/AdvertsingProfitControl/APCDatabase.accdb b/AdvertsingProfitControl/APCDatabase.accdb
index 33a1f0b..7a2529d 100644
Binary files a/AdvertsingProfitControl/APCDatabase.accdb and b/AdvertsingProfitControl/APCDatabase.accdb differ
diff --git a/AdvertsingProfitControl/DatabaseWriter.cs b/AdvertsingProfitControl/DatabaseWriter.cs
index 1463fa8..4509b31 100644
--- a/AdvertsingProfitControl/DatabaseWriter.cs
+++ b/AdvertsingProfitControl/DatabaseWriter.cs
@@ -27,14 +27,13 @@ namespace AdvertsingProfitControl
         /// Supports rolling back the database to prevent corruption.
         /// </summary>
         /// <param name="salesTable">The data table that contains the data to be inserted.</param>
-        /// <param name="connectionString"></param>
-        /// <returns></returns>
+        /// <param name="connectionString">A string pointing to the database.</param>
+        /// <returns>A DbWriterStatus object that contains a status, rows added and an error message if necessary.</returns>
         public DbWriterStatus InsertIntoSalesTable(DataTable salesTable, string connectionString)
         {
             var rowIndex = 0;
             var writerStatus = new DbWriterStatus();
             var oleDbConnection = new OleDbConnection(connectionString);
-            //IDs from the database can not be zero (0), so this will be the default value (no group).
             var oleDbCommand = new OleDbCommand
             {
                 Connection = oleDbConnection
@@ -124,13 +123,19 @@ namespace AdvertsingProfitControl
             }
             return writerStatus;
         }
-
+        /// <summary>
+        /// Updates existing records in the database for either the Projections
+        /// table or the Actual Sales table.
+        /// Supports database rollback.
+        /// </summary>
+        /// <param name="salesTable">The data table that contains the data to be inserted.</param>
+        /// <param name="connectionString">A string pointing to the database.</param>
+        /// <returns>A DbWriterStatus object that contains a status, rows added and an error message if necessary.</returns>
         public DbWriterStatus UpdateSalesTable(DataTable salesTable, string connectionString)
         {
             var updateStatus = new DbWriterStatus();
             var rowIndex = 0;
             var oleDbConnection = new OleDbConnection(connectionString);
-            //IDs from the database can not be zero (0), so this will be the default value (no group).
             var oleDbCommand = new OleDbCommand
             {
                 Connection = oleDbConnection
@@ -204,6 +209,173 @@ namespace AdvertsingProfitControl
 
             return updateStatus;
         }
+        /// <summary>
+        /// Inserts new records into the Inventory table.
+        /// Supports database rollback.
+        /// </summary>
+        /// <param name="table">The data table that contains the data to be inserted.</param>
+        /// <param name="connectionString">A string pointing to the database.</param>
+        /// <returns>A DbWriterStatus object that contains a status, rows added and an error message if necessary.</returns>
+        public DbWriterStatus InsertIntoInventoryTable(DataTable table, string connectionString)
+        {
+            var status = new DbWriterStatus();
+            var rowIndex = 0;
+            var oleDbConnection = new OleDbConnection(connectionString);
+            var oleDbCommand = new OleDbCommand
+            {
+                Connection = oleDbConnection
+            };
+            OleDbTransaction oleDbTransaction = null;
+            try
+            {
+                oleDbTransaction = oleDbConnection.BeginTransaction();
+                _oleDbConnection.Open();
+                oleDbCommand.Transaction = oleDbTransaction;
+                for (var i = 0; i < table.Rows.Count; i++)
+                {
+                    oleDbCommand.CommandText =
+                        "INSERT INTO " + table.TableName + " (BeginningInventory, Received, TotalInventory, EndingInventory, FK_AdItemID, RowAttribute, FK_AdSpecialGroupName, RowPosition, FK_DateID) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)";
+                    //New inventory Table Layout (Based on the Database's Physical Layout)
+                    //0:Beginning Inventory 1:Received 2:Total Inventory 3:Ending Inventory
+                    //4:AdItemID 5:RowAttribute 6:GroupID 7:RowPosition 8:DateID
+                    oleDbCommand.Parameters.AddWithValue("BegnningInventory", table.Rows[i][0]);
+                    oleDbCommand.Parameters.AddWithValue("Received", table.Rows[i][1]);
+                    oleDbCommand.Parameters.AddWithValue("TotalInventory", table.Rows[i][2]);
+                    oleDbCommand.Parameters.AddWithValue("EndingInventory", table.Rows[i][3]);
+                    oleDbCommand.Parameters.AddWithValue("AdItemID", table.Rows[i][4]);
+                    oleDbCommand.Parameters.AddWithValue("RowAttribute", table.Rows[i][5]);
+                    oleDbCommand.Parameters.AddWithValue("FK_AdSpecialGroup", table.Rows[i][6]);
+                    oleDbCommand.Parameters.AddWithValue("RowPosition", table.Rows[i][7]);
+                    oleDbCommand.Parameters.AddWithValue("DateID", table.Rows[i][8]);
+                    oleDbCommand.ExecuteNonQuery();
+                    oleDbCommand.Parameters.Clear();
+                    //Row index is only used to keep track of what row failed to update.
+                    rowIndex++;
+                }         
+                oleDbTransaction.Commit();
+                foreach (DataRow row in table.Rows)
+                {
+                    var rowId = RetrieveRowId(table.TableName, int.Parse(row[4].ToString()), int.Parse(row[8].ToString()));
+                    if (int.Parse(row[6].ToString()) != 0)
+                    {
+                        //Account for the ad special row.
+                        //Index 8 of the row indicates that this row is an ad special member row
+                        //so we must add one to the row position to offset the fact that a row 
+                        //is "missing" from this DataTable.
+                        //Row[7] is its row position, which is not zero index based.
+                        status.AddRowId(int.Parse(row[7].ToString()) + 1, rowId);
+                    }
+                    else
+                    {
+                        //The ad special row doesn't exist so no need to offset it.
+                        status.AddRowId(int.Parse(row[7].ToString()), rowId);
+                    }
+                }
+                status.SetStatus(WritingOperationStatus.InsertionSuccessful);
+            }
+            catch (OleDbException e)
+            {
+                status.SetStatus(WritingOperationStatus.Failed);
+                _logConsole.WriteToLog(FrmLogConsole.Level.Error, "Failed to update the database for " + table.TableName + ": " + e.Message);
+                if (rowIndex <= 0)
+                {
+                    _logConsole.WriteToLog(FrmLogConsole.Level.Error,
+                        "Failed to begin parsing data rows, var dump of erroneous row unavailable.");
+                    status.SetErrorMessage("Failed to begin parsing rows.");
+                }
+                else
+                {
+                    _logConsole.WriteToLog(FrmLogConsole.Level.Error, "Failed on row " + (rowIndex + 1) + " due to the above error. Dumping contents of row " + (rowIndex + 1) + " from " + table.TableName + ".");
+                    _logConsole.WriteToLog(FrmLogConsole.Level.Error, "Ad Item ID: \"" + table.Rows[rowIndex][4] + "\" Beginning Inventory: \"" + table.Rows[rowIndex][0]);
+                    _logConsole.WriteToLog(FrmLogConsole.Level.Error, "Received: \"" + table.Rows[rowIndex][1] + "\" Total Inventory: \"" + table.Rows[rowIndex][2] + "\" Ending Inventory: \"" + table.Rows[rowIndex][3] + "\"");
+                    _logConsole.WriteToLog(FrmLogConsole.Level.Error, "Row Attribute: \"" + table.Rows[rowIndex][5] + "\" Ad Special ID: \"" + table.Rows[rowIndex][7] + "\"");
+                    _logConsole.WriteToLog(FrmLogConsole.Level.Error, "Date ID: \"" + table.Rows[rowIndex][8] + "\"");
+                    status.SetErrorMessage("Failed to write to the database on row " + (rowIndex + 1) + ".");
+                }
+                oleDbTransaction?.Rollback();
+                _logConsole.WriteToLog(FrmLogConsole.Level.Critical, "Rollback completed successfully, " + table.TableName + " table failed on update.");
+            }
+            finally
+            {
+                _oleDbConnection.Close();
+            }
+
+            return status;
+        }
+        /// <summary>
+        /// Updates the Inventory table using the supplied DataTable
+        /// Supports rolling back the database.
+        /// </summary>
+        /// <param name="table">The table with the changes to be made.</param>
+        /// <param name="connectionString">A string pointing to the database.</param>
+        /// <returns>A DbWriterStatus object that contains a status, rows added and an error message if necessary.</returns>
+        public DbWriterStatus UpdateInventoryTable(DataTable table, string connectionString)
+        {
+            var status = new DbWriterStatus();
+            var rowIndex = 0;
+            var oleDbConnection = new OleDbConnection(connectionString);
+            var oleDbCommand = new OleDbCommand
+            {
+                Connection = oleDbConnection
+            };
+            OleDbTransaction oleDbTransaction = null;
+            try
+            {
+                oleDbTransaction = oleDbConnection.BeginTransaction();
+                _oleDbConnection.Open();
+                oleDbCommand.Transaction = oleDbTransaction;
+                for (var i = 0; i < table.Rows.Count; i++)
+                {
+                    oleDbCommand.CommandText =
+                        "UPDATE " + table.TableName + " SET BeginningInventory = ?, Received =? , TotalInventory = ?, EndingInventory = ?, FK_AdItemID = ?, RowAttribute = ?, FK_AdSpecialGroupName = ?, RowPosition = ? WHERE ID = ?";
+                    //0:ID 1:BeginningInventory 2:Received 3:TotalInventory 4:EndingInventory
+                    //5:AdItemID 6:RowAttribute 7:GroupID 8:RowPosition 9:DateID
+                    oleDbCommand.Parameters.AddWithValue("BegnningInventory", table.Rows[i][1]);
+                    oleDbCommand.Parameters.AddWithValue("Received", table.Rows[i][2]);
+                    oleDbCommand.Parameters.AddWithValue("TotalInventory", table.Rows[i][3]);
+                    oleDbCommand.Parameters.AddWithValue("EndingInventory", table.Rows[i][4]);
+                    oleDbCommand.Parameters.AddWithValue("AdItemID", table.Rows[i][5]);
+                    oleDbCommand.Parameters.AddWithValue("RowAttribute", table.Rows[i][6]);
+                    oleDbCommand.Parameters.AddWithValue("FK_AdSpecialGroup", table.Rows[i][7]);
+                    oleDbCommand.Parameters.AddWithValue("RowPosition", table.Rows[i][8]);
+                    oleDbCommand.Parameters.AddWithValue("ID", table.Rows[i][0]);
+                    oleDbCommand.ExecuteNonQuery();
+                    oleDbCommand.Parameters.Clear();
+                    //Row index is only used to keep track of what row failed to update.
+                    rowIndex++;
+                }
+                oleDbTransaction.Commit();
+                status.SetStatus(WritingOperationStatus.InsertionSuccessful);
+            }
+            catch (OleDbException e)
+            {
+                status.SetStatus(WritingOperationStatus.Failed);
+                _logConsole.WriteToLog(FrmLogConsole.Level.Error, "Failed to update the database for " + table.TableName + ": " + e.Message);
+                if (rowIndex <= 0)
+                {
+                    _logConsole.WriteToLog(FrmLogConsole.Level.Error,
+                        "Failed to begin parsing data rows, var dump of erroneous row unavailable.");
+                    status.SetErrorMessage("Failed to begin parsing rows.");
+                }
+                else
+                {
+                    _logConsole.WriteToLog(FrmLogConsole.Level.Error, "Failed on row " + (rowIndex + 1) + " due to the above error. Dumping contents of row " + (rowIndex + 1) + " from " + table.TableName + ".");
+                    _logConsole.WriteToLog(FrmLogConsole.Level.Error, "Ad Item ID: \"" + table.Rows[rowIndex][4] + "\" Beginning Inventory: \"" + table.Rows[rowIndex][0]);
+                    _logConsole.WriteToLog(FrmLogConsole.Level.Error, "Received: \"" + table.Rows[rowIndex][1] + "\" Total Inventory: \"" + table.Rows[rowIndex][2] + "\" Ending Inventory: \"" + table.Rows[rowIndex][3] + "\"");
+                    _logConsole.WriteToLog(FrmLogConsole.Level.Error, "Row Attribute: \"" + table.Rows[rowIndex][5] + "\" Ad Special ID: \"" + table.Rows[rowIndex][7] + "\"");
+                    _logConsole.WriteToLog(FrmLogConsole.Level.Error, "Date ID: \"" + table.Rows[rowIndex][8] + "\"");
+                    status.SetErrorMessage("Failed to write to the database on row " + (rowIndex + 1) + ".");
+                }
+                oleDbTransaction?.Rollback();
+                _logConsole.WriteToLog(FrmLogConsole.Level.Critical, "Rollback completed successfully, " + table.TableName + " table failed on update.");
+            }
+            finally
+            {
+                _oleDbConnection.Close();
+            }
+
+            return status;
+        }
 
         /// <summary>
         /// Inserts a new ad item into the database and returns the new item's ID number.
diff --git a/AdvertsingProfitControl/NewAddRecord.cs b/AdvertsingProfitControl/NewAddRecord.cs
index 9692812..d6ea3bf 100644
--- a/AdvertsingProfitControl/NewAddRecord.cs
+++ b/AdvertsingProfitControl/NewAddRecord.cs
@@ -2143,15 +2143,13 @@ namespace AdvertsingProfitControl
         {
             //Create two DataTables one for the new items to be added to the database
             //and one for items that have to be updated.
-            //New Sales Table Layout (Based on the Database's Physical Layout)
-            //0:Sold 1:SalePrice 2:TotalSales 3:cost 4:ProfitReturn 5:TotalProfitReturn
-            //6:FK_AdItemID 7:RowAttribute 8:FK_AdSpecialGroupName (ID) 9:RowPosition (not index based)
-            //10:FK_DateID
+            //New inventory Table Layout (Based on the Database's Physical Layout)
+            //0:Beginning Inventory 1:Received 2:Total Inventory 3:Ending Inventory
+            //4:AdItemID 5:RowAttribute 6:GroupID 7:RowPosition 8:DateID
             insertNewTable = new DataTable("Projections");
             //Update Sales Table Layout (Based on the Database's Physical Layout)
-            //0:ID 1:Sold 2:SalePrice 3:TotalSales 4:cost 5:ProfitReturn 6:TotalProfitReturn
-            //7:FK_AdItemID 8:RowAttribute 9:FK_AdSpecialGroupName (ID) 10:RowPosition (not index based)
-            //11:FK_DateID
+            //0:ID 1:BeginningInventory 2:Received 3:TotalInventory 4:EndingInventory
+            //5:AdItemID 6:RowAttribute 7:GroupID 8:RowPosition 9:DateID
             updateExistingTable = new DataTable("Projections");
             //Construct a list of column names for the projections/actual sales DataGridViews and the inventory DataGirdView.
             string[] saleColumnNames =