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' Validate input fields Private Function ValidateInputs() As Boolean If String.IsNullOrWhiteSpace(txtName.Text) Then MessageBox.Show("Name is required.", "Validation Error", MessageBoxButtons.OK, MessageBoxIcon.Warning) Return False End If

Private Sub ClearFields() txtStudentID.Clear() txtName.Clear() numAge.Value = 18 txtCourse.Clear() txtName.Focus() End Sub

conn.Open() Dim rowsAffected As Integer = cmd.ExecuteNonQuery() conn.Close()

If String.IsNullOrEmpty(searchValue) Then LoadAllStudents() Return End If Vb.net Project With Coding

Using conn As SqlConnection = GetConnection() Using cmd As New SqlCommand(query, conn) cmd.Parameters.AddWithValue("@Name", txtName.Text.Trim()) cmd.Parameters.AddWithValue("@Age", numAge.Value) cmd.Parameters.AddWithValue("@Course", txtCourse.Text.Trim())

' Load all students into DataGridView Private Sub LoadAllStudents() Dim query As String = "SELECT StudentID, Name, Age, Course FROM Students" Dim dataTable As New DataTable()

' Delete Student Private Sub btnDelete_Click(sender As Object, e As EventArgs) Handles btnDelete.Click If String.IsNullOrWhiteSpace(txtStudentID.Text) Then MessageBox.Show("Please select a student to delete.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning) Return End If ' Validate input fields Private Function ValidateInputs() As

' Search by Name Private Sub btnSearch_Click(sender As Object, e As EventArgs) Handles btnSearch.Click Dim searchValue As String = txtSearch.Text.Trim()

conn.Open() cmd.ExecuteNonQuery() conn.Close() End Using End Using

CREATE TABLE Students ( StudentID INT PRIMARY KEY IDENTITY(1,1), Name NVARCHAR(100) NOT NULL, Age INT NOT NULL, Course NVARCHAR(100) NOT NULL ); GO Name NVARCHAR(100) NOT NULL

Using conn As SqlConnection = GetConnection() Using cmd As New SqlCommand(query, conn) cmd.Parameters.AddWithValue("@StudentID", Convert.ToInt32(txtStudentID.Text))

Dim query As String = "SELECT StudentID, Name, Age, Course FROM Students WHERE Name LIKE @Search + '%'" Dim dataTable As New DataTable()