Major refactor of the Sales Form and Bill controller to make code more readable and less error prone.

The functions now only do one thing.

Tanshu.Accounts.Helpers/SelectCustomer.cs

@@ -1,102 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Windows.Forms;
-using Tanshu.Data;
-using Tanshu.Accounts.Entities;
-
-namespace Tanshu.Accounts.Helpers
-{
-    public class SelectCustomer : Tanshu.Data.BaseSelector<Customer>
-    {
-        public event CustomerEventHandler CustomerEvent;
-        public SelectCustomer(GetData<Customer> getData, bool autoClose) : base(getData, true, "List of Products")
-        {
-            var filters = new List<string> {"Universal"};
-            SetFilterColumns(filters);
-            grid.Columns["CustomerID"].Visible = false;
-        }
-
-        protected override void FilterChanged(Dictionary<string, string> filter)
-        {
-            //data = new CustomerBI().GetFilteredCustomers(filter["Universal"].Split(' ')).ToList();
-            data = getData(filter);
-            bindingSource.DataSource = data;
-        }
-        protected override void UpdateDisplay(Customer item)
-        {
-            DisplayLabel = item == null ? "" : string.Format("Chosen Customer is {0} with phone number {1}", item.Name, item.Phone);
-        }
-
-        protected override Customer HandleKeydown(object sender, ExtendedKeyEventArgs e)
-        {
-            var customer = bindingSource.Current as Customer;
-
-            if (CustomerEvent == null)
-            {
-                e.Handled = false;
-                return customer;
-            }
-            Guid? id = null;
-            if ((customer != null) && (e.KeyCode == Keys.F2))
-                id = customer.CustomerID;
-
-            if ((e.KeyCode == Keys.F1) || (e.KeyCode == Keys.F2))
-            {
-                customer = CustomerEvent(sender, new CustomerEventArgs(id, base.filterColumns["Universal"]));
-                e.Handled = customer != null;
-            }
-            return customer;
-        }
-        #region Designer Code
-        /// <summary>
-        /// Required designer variable.
-        /// </summary>
-        private System.ComponentModel.IContainer components = null;
-
-        /// <summary>
-        /// Clean up any resources being used.
-        /// </summary>
-        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
-        protected override void Dispose(bool disposing)
-        {
-            if (disposing && (components != null))
-            {
-                components.Dispose();
-            }
-            base.Dispose(disposing);
-        }
-
-        #region Windows Form Designer generated code
-
-        /// <summary>
-        /// Required method for Designer support - do not modify
-        /// the contents of this method with the code editor.
-        /// </summary>
-        private void InitializeComponent()
-        {
-            this.components = new System.ComponentModel.Container();
-        }
-
-        #endregion
-        #endregion
-    }
-    public delegate Customer CustomerEventHandler(object sender, CustomerEventArgs e);
-    public class CustomerEventArgs : EventArgs
-    {
-        public CustomerEventArgs(Guid? customerID, string phone)
-        {
-            CustomerID = customerID;
-            Phone = phone;
-        }
-        public Guid? CustomerID
-        {
-            get;
-            private set;
-        }
-        public string Phone
-        {
-            get;
-            private set;
-        }
-    }
-}

Tanshu.Accounts.Helpers/Tanshu.Accounts.Helpers.csproj

@@ -70,9 +70,6 @@
     <Compile Include="SelectVoidReason.cs">
       <SubType>Form</SubType>
     </Compile>
-    <Compile Include="SelectCustomer.cs">
-      <SubType>Form</SubType>
-    </Compile>
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>