Converting string to integer VB.NET - vb.net-2010

Question

I'm having trouble finding the right format for converting my txtID and txtCatID into integers since it's in numbers in the database access.
Code
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _
Handles btnSave.Click
Dim sqlinsert As String
sqlinsert = _
"INSERT INTO Products (ProductID, Product, UnitPrice, CategoryName, CategoryID)" & _
" VALUES (#ProductID, #Product, #UnitPrice, #CategoryName, #CategoryID)"
Dim cmd As New OleDb.OleDbCommand(sqlinsert, con1)
cmd.Parameters.Add(New OleDbParameter("#ProductID", (txtID.Text)))
cmd.Parameters.Add(New OleDbParameter("#Product", txtProd.Text))
cmd.Parameters.Add(New OleDbParameter("#UnitPrice", txtPrice.Text))
cmd.Parameters.Add(New OleDbParameter("#CategoryName",txtCategory.Text))
cmd.Parameters.Add(New OleDbParameter("#CategoryID", (txtCatID.Text)))
con1.Open()
cmd.ExecuteNonQuery()
con1.Close()
ClearTextBox(Me)
RefreshDGV()
Me.Close()

Answer 1

You can convert String to int by doing like this:
For C#: int val = Int32.Parse("12");
For VB.NET: Dim val as Integer = CInt("12")
Here you can find all Type Conversion Functions (Visual Basic).
Here you have How to: Convert a String to a Number (C# Programming Guide).

Answer 2

You can convert string from a TextBox to an integer using:
Dim myInt as Integer = CInt(Textbox1.Text)
Otherwise, if you are asking how to ensure that an integer is appended into an SQL file or Access file using VB.NET, then that's a different question.

Answer 3

I solved it:
Dim productID As Integer
If (Integer.TryParse(txtID.Text, productID)) Then
cmd.Parameters.Add(New OleDbParameter("#ProductID", productID))
Else
Throw New ArgumentException("Entered ProductID is not a valid integer.")
End If
cmd.Parameters.Add(New OleDbParameter("#Product", txtProd.Text))
Dim price As Double
If (Double.TryParse(txtPrice.Text, price)) Then
cmd.Parameters.Add(New OleDbParameter("#UnitPrice", txtPrice.Text))
Else
Throw New ArgumentException("Invalid.")
End If
cmd.Parameters.Add(New OleDbParameter("#CategoryName", txtCategory.Text))
Dim id As Integer
If (Integer.TryParse(txtCatID.Text, id)) Then
cmd.Parameters.Add(New OleDbParameter("#CategoryID", id))
Else
Throw New ArgumentException("Entered Category ID is Invalid.")
End If