When writing this code, did you completely ignore what Intellisense was telling you ? Does the ListBox.ObjectCollection have ANY property called "Selected" ? You should be using ListBox.SelectedIndex or ListBox.SelectedItem.ToString().
I'm ignoring the rest of the problems with the code since you are obviously beginning to learn. On Apr 28, 10:54 am, gagandeep sharma <[email protected]> wrote: > hi evry1 > > i'm creating a application in vb.net in which there are three textbox > contol, one listbox contol,and one button. > in listbox control there are three values , addition, subtraction and > multiplication > and my problem is taking values from two textbox contol, then selct one of > the value from listbox contol and clicking on submit button the possible > result display in third textbox ,but when i select one of the value from > listbox contol there is a runtime error-- missingmember exception. > > if any one can have any ideas then pls help me-- the code of my program is > given below > > Public Class Form1 > > Dim a As Integer > > Dim b As Integer > > Dim c As Integer > > Private Sub TextBox2_TextChanged(ByVal sender As System.Object, ByVal > e AsSystem.EventArgs) > Handles TextBox2.TextChanged > > End Sub > > Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal > e AsSystem.EventArgs) > Handles TextBox1.TextChanged > > End Sub > > Public Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, > ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged > > End Sub > > Private Sub TextBox3_TextChanged(ByVal sender As System.Object, ByVal > e AsSystem.EventArgs) > Handles TextBox3.TextChanged > > End Sub > > Private Sub Button1_Click(ByVal sender As System.Object, ByVal e > AsSystem.EventArgs) > Handles Button1.Click > > If ListBox1.Items(0).Selected Then > > a = TextBox1.Text > > b = TextBox2.Text > > c = a + b > > TextBox3.Text = c > > End If > > If ListBox1.Items(1).Selected Then > > a = TextBox1.Text > > b = TextBox2.Text > > c = a - b > > TextBox3.Text = c > > End If > > If ListBox1.Items(2).Selected Then > > a = TextBox1.Text > > b = TextBox2.Text > > c = a * b > > TextBox3.Text = c > > End If > > End Sub > > End Class > > -- > GO and LEAD from Whereever You are. > Think Big and Think Fast.
