I have multiple dropdownlist in a page and would like to disable all if user selects a checkbox which reads disable all. So far I have this code and it is not working. Any suggestions?
foreach (Control c in this.Page.Controls)
{
if (c is DropDownList)
((DropDownList)(c)).Enabled = false;
}
It would be easiest if you put all the controls you want to disable in a panel and then just enable/disable the panel.
Each control has child controls, so you'd need to use recursion to reach them all:
protected void DisableControls(Control parent) {
foreach(Control c in parent.Controls) {
if (c is DropDownList) {
((DropDownList)(c)).Enabled = false;
}
DisableControls(c);
}
}
Then call it like so:
protected void Event_Name(...) {
DisableControls(Page); // use whatever top-most control has all the dropdowns or just the page control
}
You have to do this recursive, I mean you have to disable child controls of controls to :
protected void Page_Load(object sender, EventArgs e)
{
DisableChilds(this.Page);
}
private void DisableChilds(Control ctrl)
{
foreach (Control c in ctrl.Controls)
{
DisableChilds(c);
if (c is DropDownList)
{
((DropDownList)(c)).Enabled = false;
}
}
}
Here's a VB.NET version which also takes an optional parameter so it can be used for enabling the controls as well.
Private Sub SetControls(ByVal parentControl As Control, Optional ByVal enable As Boolean = False)
For Each c As Control In parentControl.Controls
If TypeOf (c) Is CheckBox Then
CType(c, CheckBox).Enabled = enable
ElseIf TypeOf (c) Is RadioButtonList Then
CType(c, RadioButtonList).Enabled = enable
End If
SetControls(c)
Next
End Sub
If you really want to disable all controls on a page, then the easiest way to do this is to set the form's Disabled property to true.
ASPX:
<body>
<form id="form1" runat="server">
...
</form>
</body>
Code-behind:
protected void Page_Load(object sender, EventArgs e)
{
form1.Disabled = true;
}
But of course, this will also disable your checkbox, so you won't be able to click the checkbox to re-enable the controls.