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Why the cmbcategory.selectedindex change is not working on if condition

Posted on 2012-03-14
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Last Modified: 2012-03-14
Imports System
Imports System.Data
Imports System.Data.SqlClient

Public Class displayitemcodes
    Dim con As SqlConnection
    Dim cmd As SqlCommand
    Dim da As SqlDataAdapter
    Dim dt As DataTable
    Dim s As String

   
    Private Sub cmbcategory_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmbcategory.SelectedIndexChanged
        If cmbcategory.SelectedItem.ToString() <> "--Select Category--" Then
            MsgBox("Done")
        End If
    End Sub

    Private Sub displayitemcodes_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        con = New SqlConnection("server=ADMIN-PC\SQLEXPRESS;database=stocktracker;Integrated security=true")
        s = "select distinct category from mstitems"
        da = New SqlDataAdapter(s, con)
        dt = New DataTable()
        da.Fill(dt)

        Dim newCustomersRow As DataRow = dt.NewRow()

        newCustomersRow("category") = "--Select Category--"
        dt.Rows.InsertAt(newCustomersRow, 0)

        With cmbcategory


            .DisplayMember = "category"
            .ValueMember = "category"
            .DataSource = dt




        End With
        cmbcategory.Refresh()
    End Sub
End Class
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Question by:searchsanjaysharma
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Accepted Solution

by:
zofcentr earned 500 total points
ID: 37718918
I am not sure whether I understand clearly your problem.
If you are asking why delegate cmbcategory_SelectedIndexChanged has not been called then answer is that maybe you did not have bound this method correctly the event.
Check properties/events of combobox.

If event is raised and method is called but statement (
If cmbcategory.SelectedItem.ToString() <> "--Select Category--") always returns false
then answer is : cmbcategory.SelectedItem.ToString() returns string equal to "System.Data.DataRowView".

Try something like this:
If CType(cmbcategory.SelectedItem, DataRowView)("category").ToString() <> "--Select Category--"
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Author Comment

by:searchsanjaysharma
ID: 37718935
Done, You undestood, Thanx.
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Author Closing Comment

by:searchsanjaysharma
ID: 37718937
ok
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