How to use C# to Print Invoice

Mostafa Kaisoun
12y
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Article

InvoiceC.zip

Introduction

This is a example of how to print an Invoice with C#. It shows:

How to create a report using PrintPreviewDialog control and PrintDocument control?
How to draw Invoice head?
How to draw the table of products and its price?
How to compute and draw an Invoice total?

My Project has three forms:

frmInvoice: to bind DataGrid with all Orders from Northwind database file.
frmInput: to choose one Order which you want to print its Invoice.
frmOrder: to display Invoice on DataGrid, then you can Print Preview or Print the Invoice as Report.

Also, we need three classes for printing:

System.Windows.Forms.PrintDialog
System.Windows.Forms.PrintPreviewDialog
System.Drawing.Printing.PrintDocument.

Of course you can use any database file instead of Northwind.mdb and change my code to connect with the database; also you can change my SQL string to bind a DataGrid with data.

About the Code

Bind the DataGrid in frmInvoice form with all Orders:

// If you are using SQL Server, please replace previous lines with following:

string strCon = @"provider=sqloledb;Data Source=PC;Initial Catalog=" +
"Northwind;Integrated Security=SSPI" + ";";

// and replace 'Data Source=PC' with the name of your system

try
{

// Get data from tables: Orders, Customers, Employees, Products, Order Details:

    string InvSql = "SELECT Customers.CompanyName, Customers.City, " +
    "Employees.FirstName + Space(1) + Employees.LastName AS Salesperson, " +
    "Orders.OrderID, Orders.OrderDate, " +
    "[Order Details].ProductID, Products.ProductName, [Order Details].UnitPrice, " +
    "[Order Details].Quantity, [Order Details].Discount, "+
    "CCur([Order Details].UnitPrice*[Quantity]*(1-[Discount])/100)*100 AS ExtendedPrice, " +
    "Orders.Freight " + "FROM Products INNER JOIN ((Employees INNER JOIN " +
    "ON Employees.EmployeeID = Orders.EmployeeID) " +
    "INNER JOIN [Order Details] ON Orders.OrderID = [Order Details].OrderID) " +
    "ON Products.ProductID = [Order Details].ProductID;";   // create an OleDbDataAdapter
    OleDbDataAdapter datAdp = new OleDbDataAdapter(InvSql, strCon);

// create a command builder
OleDbCommandBuilder cBuilder = new OleDbCommandBuilder(datAdp);

// create a DataTable to hold the query results
DataTable dTable = new DataTable;

// fill the DataTable
datAdp.Fill(dTable);

// set DataSource of DataGrid
datGrid.DataSource = dTable;
}

catch (Exception e)
{
MessageBox.Show(e.ToString());
}

Bind the DataGrid in the frmOrder form with one Order:

// Declare 'InvoiceOrder' in 'clsGlobal' class, 'InvoiceOrder' is the number of Order which you select:

int intOrder = int.Parse(clsGlobal.InvoiceOrder);
string MyDataFile = Application.StartupPath + @"\DataFile\Northwind.mdb";
string MyPass = "";
dtring strCon = "provider=microsoft.jet.oledb.4.0;data source=" +
MyDataFile + ";" + "Jet OLEDB:Database Password=" + MyPass + ";";

try
{
// Get Invoice Data:
InvSql = "SELECT [Order Details].ProductID, " +
    "Products.ProductName, [Order Details].UnitPrice, " +
    "[Order Details].Quantity, [Order Details].Discount, " +
    "CCur([Order Details].UnitPrice*[Quantity]*(1-[Discount])/100)*100 " +
    "AS ExtendedPrice " +
    "FROM Products INNER JOIN [Order Details] " +
    "ON Products.ProductID=[Order Details].ProductID " +
    "WHERE [Order Details].OrderID = " + intOrder;

// create an OleDbDataAdapter
  OleDbDataAdapter datAdp = new OleDbDataAdapter(InvSql, strCon);

// create a command builder
  OleDbCommandBuilder cBuilder = new OleDbCommandBuilder(datAdp);

// create a DataTable to hold the query results
  DataTable dTable = new DataTable;

// fill the DataTable
datAdp.Fill(dTable);

// Create a TableStyle to format Datagrid columns.

ordGrid.TableStyles.Clear();
  DataGridTableStyle tableStyle = new DataGridTableStyle;
foreach (DataColumn dc in dTable.Columns)
{
  DataGridTextBoxColumn txtColumn = new DataGridTextBoxColumn;
txtColumn.MappingName = dc.ColumnName;
txtColumn.HeaderText = dc.Caption;
switch (dc.ColumnName.ToString())
{
case "ProductID": // Product ID
            txtColumn.HeaderText = "Product ID";
            txtColumn.Width = 60;
         break;
         case "ProductName": // Product Name
            txtColumn.HeaderText = "Product Name";
            txtColumn.Width = 110;
         break;
         case "UnitPrice": // Unit Price
          txtColumn.HeaderText = "Unit Price";
            txtColumn.Format = "0.00";
            txtColumn.Alignment = HorizontalAlignment.Right;
            txtColumn.Width = 60;
         break;
         case "Discount": // Discount
            txtColumn.HeaderText = "Discount";
            txtColumn.Format = "p"; // percent
            txtColumn.Alignment = HorizontalAlignment.Right;
            txtColumn.Width = 60;
         break;
         case "Quantity": // Quantity
            txtColumn.HeaderText = "Quantity";
            txtColumn.Alignment = HorizontalAlignment.Right;
             txtColumn.Width = 50;
         break;
         case "ExtendedPrice": // Extended Price
            txtColumn.HeaderText = "Extended Price";
            txtColumn.Format = "0.00";
            txtColumn.Alignment = HorizontalAlignment.Right;
            txtColumn.Width = 90;
         break;
      }
      tableStyle.GridColumnStyles.Add(txtColumn);
   }

   tableStyle.MappingName = dTable.TableName;
   ordGrid.TableStyles.Add(tableStyle);

// set DataSource of DataGrid
   ordGrid.DataSource = dTable.DefaultView;
}

catch (Exception e)
{
MessageBox.Show(e.ToString());
}
}

Declare and initialize three instances for printing:

private System.Windows.Forms.PrintDialog prnDialog;
private System.Windows.Forms.PrintPreviewDialog prnPreview;
private System.Drawing.Printing.PrintDocument prnDocument;
this.prnDialog = new System.Windows.Forms.PrintDialog();
this.prnPreview = new System.Windows.Forms.PrintPreviewDialog();
this.prnDocument = new System.Drawing.Printing.PrintDocument();

// the Event of 'PrintPage'
prnDocument.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(prnDocument_PrintPage);

To draw something on the report (as line or text):

Get Left Margin, Right Margin, Top Margin, Bottom Margin, Report Width and Report Height:

// Result of the Event 'PrintPage'

private void prnDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
    leftMargin = (int)e.MarginBounds.Left; // leftMargin, rightMargin, ... Declared before
    rightMargin = (int)e.MarginBounds.Right;
    topMargin = (int)e.MarginBounds.Top;
    bottomMargin = (int)e.MarginBounds.Bottom;
    InvoiceWidth = (int)e.MarginBounds.Width;
    InvoiceHeight = (int)e.MarginBounds.Height;

    // Draw Invoice Head
    SetInvoiceHead(e.Graphics);
}
Set Font and Color:

Font InvTitleFont = new Font("Arial", 24, FontStyle.Regular);
SolidBrush HeadBrush = new SolidBrush(Color.Blue);
Set the Font Height and Font Width and coordinate then use the DrawString method:

private void SetInvoiceHead (Graphics g)
{
    //Invoice title:
    string InvTitle = "International Food Company";

   //Title Font:
    Font InvTitleFont = new Font("Arial", 24, FontStyle.Regular);

    //Title Color:
    SolidBrush HeadBrush = new SolidBrush(Color.Blue);

    //Title Height:
    int InvTitleHeight = (int)(InvTitleFont.GetHeight(g));

    //Title Length:
    int lenInvTitle = (int)g.MeasureString(InvTitle, InvTitleFont).Width;

    //Coordinate:
    int CurrentX = leftMargin + (InvoiceWidth - lenInvTitle) / 2; //to set the title in center
    int CurrentY = topMargin + InvTitleHeight;

    //draw the title:
    g.DrawString(InvTitle, InvTitleFont, HeadBrush, CurrentX, CurrentY);
}