Why would it populate the text box in the form load event ?If you populate in the selectedindexchanged event than this should not error out.Sample app:One form:Form1.vbPublic Class Form1 Inherits System.Windows.Forms.Form#Region " Windows Form Designer generated code " Public Sub New() MyBase.New() 'This call is required by the Windows Form Designer. InitializeComponent() 'Add any initialization after the InitializeComponent() call End Sub 'Form overrides dispose to clean up the component list. Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components.Dispose() End If End If MyBase.Dispose(disposing) End Sub 'Required by the Windows Form Designer Private components As System.ComponentModel.IContainer 'NOTE: The following procedure is required by the Windows Form Designer 'It can be modified using the Windows Form Designer. 'Do not modify it using the code editor. Friend WithEvents TextBox1 As System.Windows.Forms.TextBox Friend WithEvents ComboBox1 As System.Windows.Forms.ComboBox <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.TextBox1 = New System.Windows.Forms.TextBox Me.ComboBox1 = New System.Windows.Forms.ComboBox Me.SuspendLayout() ' 'TextBox1 ' Me.TextBox1.Location = New System.Drawing.Point(0, 24) Me.TextBox1.Name = "TextBox1" Me.TextBox1.Size = New System.Drawing.Size(120, 20) Me.TextBox1.TabIndex = 0 Me.TextBox1.Text = "" ' 'ComboBox1 ' Me.ComboBox1.Items.AddRange(New Object() {"Yes", "No", "Maybe", "N/A"}) Me.ComboBox1.Location = New System.Drawing.Point(0, 0) Me.ComboBox1.Name = "ComboBox1" Me.ComboBox1.Size = New System.Drawing.Size(121, 21) Me.ComboBox1.TabIndex = 1 ' 'Form1 ' Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(120, 46) Me.Controls.Add(Me.ComboBox1) Me.Controls.Add(Me.TextBox1) Me.Name = "Form1" Me.Text = "Form1" Me.ResumeLayout(False) End Sub#End Region Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged Me.TextBox1.Text = Me.ComboBox1.Text.ToString End Sub Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Me.TextBox1.Text = "IM IN ON LOAD" End SubEnd Class
The form load event only loads when the form is initially loaded.So I am not sure why you are receiving an error.
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