Vb Net Lab Programs For Bca Students Fix [portable] (2026)

Below are common issues found in standard BCA lab assignments and how to fix them. 1. The Simple Calculator: Type Mismatch

The primary objectives of these lab exercises are to enable students to:

: Create a database Students.mdb (Access) with fields: RollNo, Name, Course, Percentage. Perform CRUD (Create, Read, Update, Delete) operations using VB.NET. vb net lab programs for bca students fix

Try ' Code that might cause an error result = CInt(TextBox1.Text) / CInt(TextBox2.Text) Catch ex As DivideByZeroException MessageBox.Show("Cannot divide by zero!", "Error") Catch ex As FormatException MessageBox.Show("Please enter valid numbers.", "Error") Catch ex As Exception MessageBox.Show("An unexpected error occurred: " & ex.Message) Finally ' Code that always runs (cleanup) TextBox1.Clear() TextBox2.Clear() End Try

Module StringManip Sub Main() Dim str As String = "BCA Student" Console.WriteLine("Original: " & str) Console.WriteLine("Length: " & str.Length) Console.WriteLine("Uppercase: " & str.ToUpper()) Console.WriteLine("Reversed: " & StrReverse(str)) Console.ReadLine() End Sub End Module Use code with caution. 4. Database Connectivity: ADO.NET (Login Form) Below are common issues found in standard BCA

Instead of Button1 , Button2 , use btnCalculate , btnClear , btnExit . Instead of TextBox1 , use txtInput , txtResult . This makes debugging infinitely easier.

Double-click the error message in the Error List window—Visual Studio will take you directly to the offending line. Review the syntax rule and correct it. Perform CRUD (Create, Read, Update, Delete) operations using

Hover your mouse over any variable while debugging to see its current value in a data tip. For a more systematic approach: