I think that u have to : - put true autopostback property of the button - and validate code in page_load segment
Try and tell me.... On Mon, Apr 27, 2009 at 11:54 PM, 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. > > > -- Carlos Andrés Arias Blanco 8864-3573
