How To Make A Credit Card Determiner In VB.NET

Today, we are going to make a Credit Card Determiner in VB.NET.
First if all open your Visual Studio or Visual Basic, create a new Project, add two text boxes & a button, change the button text property to check or whatever you want.

I recommend you to set your tools like this

Finally double click your form and add all of these codes

Public Class form1
    Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        If Asc(e.KeyChar) <> 13 AndAlso Asc(e.KeyChar) <> 8 _
            AndAlso Not IsNumeric(e.KeyChar) Then
            MessageBox.Show("Please Enter Numbers Only")
            e.Handled = True
        End If
    End Sub

    Public Sub visa()
        TextBox1.SelectionStart = (0)
        TextBox1.SelectionLength = (1)
        If TextBox1.SelectedText = 4 And TextBox1.Text.Length = 16 Then
            TextBox2.Text = " Visa Card"
        Else
            mastercard()
        End If
    End Sub
    Public Sub mastercard()
        TextBox1.SelectionStart = (0)
        TextBox1.SelectionLength = (2)
        If TextBox1.SelectedText = 51 And TextBox1.Text.Length = 16 Then
            TextBox2.Text = " MasterCard"
        ElseIf TextBox1.SelectedText = 52 And TextBox1.Text.Length = 16 Then
            TextBox2.Text = " MasterCard"
        ElseIf TextBox1.SelectedText = 53 And TextBox1.Text.Length = 16 Then
            TextBox2.Text = " MasterCard"
        ElseIf TextBox1.SelectedText = 54 And TextBox1.Text.Length = 16 Then
            TextBox2.Text = " MasterCard"
        ElseIf TextBox1.SelectedText = 55 And TextBox1.Text.Length = 16 Then
            TextBox2.Text = " MasterCard"
        Else
            americanexpress()
        End If
    End Sub
    Public Sub americanexpress()
        TextBox1.SelectionStart = (0)
        TextBox1.SelectionLength = (2)
        If TextBox1.SelectedText = 34 And TextBox1.Text.Length = 15 Then
            TextBox2.Text = "American Express"
        ElseIf TextBox1.SelectedText = 35 And TextBox1.Text.Length = 15 Then
            TextBox2.Text = "American Express"
        ElseIf TextBox1.SelectedText = 36 And TextBox1.Text.Length = 15 Then
            TextBox2.Text = "American Express"
        ElseIf TextBox1.SelectedText = 37 And TextBox1.Text.Length = 15 Then
            TextBox2.Text = " American Express"
        Else
            diners1()
        End If
    End Sub
    Public Sub diners1()
        TextBox1.SelectionStart = (0)
        TextBox1.SelectionLength = (3)
        If TextBox1.SelectedText = 300 And TextBox1.Text.Length = 14 Then
            TextBox2.Text = " Diners Club"
        ElseIf TextBox1.SelectedText = 301 And TextBox1.Text.Length = 14 Then
            TextBox2.Text = " Diners Club"
        ElseIf TextBox1.SelectedText = 302 And TextBox1.Text.Length = 14 Then
            TextBox2.Text = " Diners Club"
        ElseIf TextBox1.SelectedText = 303 And TextBox1.Text.Length = 14 Then
            TextBox2.Text = " Diners Club"
        ElseIf TextBox1.SelectedText = 304 And TextBox1.Text.Length = 14 Then
            TextBox2.Text = " Diners Club"
        ElseIf TextBox1.SelectedText = 305 And TextBox1.Text.Length = 14 Then
            TextBox2.Text = " Diners Club"
        Else
            diners2()
        End If
    End Sub
    Public Sub diners2()
        TextBox1.SelectionStart = (0)
        TextBox1.SelectionLength = (2)
        If TextBox1.SelectedText = 36 And TextBox1.Text.Length = 14 Then
            TextBox2.Text = " Diners Club"
        ElseIf TextBox1.SelectedText = 38 And TextBox1.Text.Length = 14 Then
            TextBox2.Text = " Diners Club"
        Else
            discover1()
        End If
    End Sub
    Public Sub discover1()
        TextBox1.SelectionStart = (0)
        TextBox1.SelectionLength = (4)
        If TextBox1.SelectedText = 6011 And TextBox1.Text.Length = 16 Then
            TextBox2.Text = " Discover Card"
        Else
            discover2()
        End If
    End Sub
    Public Sub discover2()
        TextBox1.SelectionStart = (0)
        TextBox1.SelectionLength = (2)
        If TextBox1.SelectedText = 65 And TextBox1.Text.Length = 16 Then
            TextBox2.Text = " Discover Card"
        Else
            TextBox2.Text = "Unknown Card"
        End If
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If TextBox1.Text = "" Then
        Else
            mastercard()
            discover1()
            discover2()
            diners1()
            diners2()
            americanexpress()
            visa()
        End If
    End Sub
End Class

Debug and see whether it works for you or not, you can download the source code from below button.