| Error | Solution | | :--- | :--- | | SqlException: Invalid column name | Check your table schema matches the insert query. | | Conversion from string to type Decimal | Use CDec() or Decimal.TryParse() for user input. | | PrintDocument shows blank | Ensure you call e.HasMorePages = false and check margins. | | DataGridView not refreshing | After ExecuteNonQuery , re-bind using LoadProducts() . |
Here is the essential relational schema consisting of three primary tables: , Invoices , and InvoiceDetails .
Private Sub btnAddProduct_Click(sender As Object, e As EventArgs) Handles btnAddProduct.Click ' Assume a popup product search form returns selected product Dim frm As New frmProductSearch() If frm.ShowDialog() = DialogResult.OK Then Dim newRow As DataRow = dtDetails.NewRow() newRow("ProductID") = frm.SelectedProductID newRow("ProductName") = frm.SelectedProductName newRow("Quantity") = 1 newRow("Rate") = frm.Rate ' Tax calculation will be done row-by-row based on GST% Dim gstPercent As Decimal = frm.GSTPercent Dim taxable As Decimal = newRow("Quantity") * newRow("Rate") newRow("TaxableValue") = taxable newRow("CGST") = Math.Round(taxable * (gstPercent / 100) / 2, 2) newRow("SGST") = Math.Round(taxable * (gstPercent / 100) / 2, 2) dtDetails.Rows.Add(newRow) CalculateTotals() End If End Sub
Handles SQL commands to interact with the database. Database Schema (SQL Server Example) vbnet+billing+software+source+code
The demand for efficient billing software has increased significantly in recent years, particularly among small to medium-sized businesses. A well-structured billing system can streamline financial operations, reduce errors, and enhance customer satisfaction. This review focuses on a VB.NET-based billing software source code, which claims to offer a comprehensive solution for businesses seeking to automate their billing processes.
Who should avoid using it as-is
Suggestions for improvement
The source code projects above showcase essential features common to modern billing systems that you can implement.
Which you plan to use (SQL Server, MS Access, SQLite)?
: Stores essential information such as name, address, ID, and contact details. | Error | Solution | | :--- |
This logic typically uses a DataGridView to temporarily hold items before saving them to the database.
Private Sub RefreshBillGrid() DataGridView1.DataSource = Nothing DataGridView1.DataSource = billItems End Sub
Use of SQLClient to perform CRUD (Create, Read, Update, Delete) operations on tables like Products , Customers , and Invoices . | | DataGridView not refreshing | After ExecuteNonQuery
In the world of desktop application development, remains a powerful, rapid application development (RAD) tool for creating business solutions. One of the most common requests from junior developers and IT students is for vbnet billing software source code —a ready-to-study, functional invoicing system.