VB.NET- Changing .Text property of Textbox throws Null Reference Exception

Question

This MUST be trivial. I do this for a living and CAN NOT figure out why I am getting this exception:

System.NullReferenceException was unhandled Message=Object reference not set to an instance of an object.

Here is the code:

Public Class frmMain

Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Dim counties() As String

    counties = {"", "Huntsville, AL", "Madison, AL", "Rural Madison County, AL", "Taft, TN"}
    Me.cbCounties.DataSource = counties

    Me.lblStatus.Text = "[ Please select a county ]"
    Me.lblStatus.Left = Me.ClientSize.Width \ 2 - Me.lblStatus.Width \ 2



End Sub

Private Sub cbCounties_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cbCounties.SelectedIndexChanged
    Select Case cbCounties.SelectedIndex
        Case 1
            txtTaxRate.Text = "8.00%" 'Issue is these, when index is changed.
        Case 2
            txtTaxRate.Text = "8.50%"
        Case 3
            txtTaxRate.Text = "5.50"
        Case 4
            txtTaxRate.Text = "9.50%"
        Case Else
            txtTaxRate.Text = Nothing
    End Select

    Me.lblStatus.Text = "[ Please enter net amount ]"
    Me.lblStatus.Left = Me.ClientSize.Width \ 2 - Me.lblStatus.Width \ 2

End Sub

End Class

Help?

See comment inside of code. Specifically, it is thrown inside of the select case statement, referring to the txtTaxRate TextBox — Josh McKearin
– Josh McKearin, Commented Aug 16, 2012 at 4:37
Is this after you changed it a couple of times? setting txtTaxRate = Nothing and later trying to set txtTaxRate.Text to something else will cause some problems. try changing txtTaxRate = Nothing to txtTaxRate.Text = "" — Adriaan Stander
– Adriaan Stander, Commented Aug 16, 2012 at 4:38
Alright... that was it. Make this an answer and I will accept. — Josh McKearin
– Josh McKearin, Commented Aug 16, 2012 at 4:39

Adriaan Stander · Accepted Answer · 2012-08-16 04:41:04Z

2

Is this after you changed it a couple of times?

Setting txtTaxRate = Nothing and later trying to set txtTaxRate.Text to something else will cause some problems.

You are setting the textbox object to nothing, and later trying to reference one of its properties.

Try changing

txtTaxRate = Nothing

to

txtTaxRate.Text = ""

answered Aug 16, 2012 at 4:41

Adriaan Stander

167k32 gold badges294 silver badges288 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

VB.NET- Changing .Text property of Textbox throws Null Reference Exception

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related