Change Drop Down List Value In ASP.NET (VB)

May 18, 2012

how to change 2nd drop down list value after I selected the 1st drop down list value.

The best example is country and state. After user selected country, the state value should change accordingly.

I am still new in ASP.NET and I know in PHP it can be easily done using javascript.

May I know how to do it in ASP.NET using VB language?

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Change A Drop-down Menu In VB From Click-to-change To Just Change When Selected?

Feb 4, 2012

I'm using Visual Studio 2010 / VB / dot net 4.0, and I have a drop-down menu in my left column that switches resource languages for the end user. It reads like this:

--------English ------- <<- Engish is always the default top language option
French |
Spanish |

[code].....

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Private Sub cmbClassLists_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles cmbClassLists.MouseDown
If cmbClassLists.DroppedDown And Not cmbClassLists.SelectedIndex = -1 Then

[code].....

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Protected Sub registerStudButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles registerStudButton.Click

[Code]...

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DesignationTableá From my table i like to display only two in my drop down list

[code].....

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Dim sched = scheduleDateVal.toString("d"
If Holidays.Items.Contains(New ListItem(sched.ToString("d"))) Then
ScheduleDate.Text = scheduleDateVal.AddDays(1).toString("d")
End If

Holidays is a dropdown list bound to a database so that I can add a day to a scheduledate if it happens to fall on a holiday. This works if I add a string value to sched rather than converting scheduledateval to a string.

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Sub Worksheet_Change(ByVal Target As Range)
If InRange(Target, Range("AngleConf")) Then
Call resistance 'Actualiser le r´┐Żsultat mecanique

[code].....

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May 15, 2012

My dropdownlist is set to databine like this...

dt = dal.FillDataTable(SqlConnectionString, "SELECT SQL Query Statement")
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dropdownlist1.datatextfield = dt.columns.item(0).tostring
dropdownlist1.databind()

This is turn populates my dropdownlist, when a user selects a value, it is then populated to the remaining textboxes on the remaining forms with a session call...

dropdownlist2.add(ctype(session.item("valOne"), String))

Through this session it populates the one value, is it possible to display the selected value but also include all other dropdownlist items in case they want to change thier selection?

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[Code]....

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Mar 31, 2011

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Dim selectedIntake As String = intakeDropDownList.SelectedItem.Text()
Dim selectedSupervisor As String = supervisorDropDownList.SelectedItem.Text()
.supervisor_ID = selectedSupervisor(0), _

[Code]....

This is the error message I get :

The INSERT statement conflicted with the FOREIGN KEY constraint "FK_student_Details_lecturer_Details". The conflict occurred in database "SKTM-AAS", table "dbo.lecturer_Details", column 'supervisor_ID'. The statement has been terminated.

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Mar 12, 2012

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Public Class Parameters
Public Property server As String
Public Property replica As String
Public Propery path As String
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[Code]...

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Nov 3, 2009

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[Code]...

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I have read somewhere that I should give Page as a parameter to that thread and then find that drop down lists and populate them. But that is not working.

Here is a function that is called when another thread starts:

protected void GetCountries(object o)
{
if (Session["Countries"] == null)
{

[Code]....

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I have a couple of dropdown lists like this

<asp:DropDownList runat="server" OnSelectedIndexChanged="Update_ddls" AutoPostBack="true" ID="ddl1" />
<asp:DropDownList runat="server" ID="ddl2" />

[Code]...

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Is there a way to re-add the previously deleted items in the Update_dlls function without re-databinding because if I re-databind I lose the selected item in the ddl?

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...

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[Code]...

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[Code]...

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I am getting the following error Collection was modified; enumeration operation may not execute

HTML

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
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[Code]....

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Private Sub frmProcessEmail_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load
'starts up email
start()

[code]....

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