in the Editor, click on the Image Manager tool, then click "Upload",
uncheck "Overwrite if file exists?".
If I upload three existing files, I get an alert dialog with three times of "A file with a name same as the target already exists!".
Is there a way to only display one error message "A file with a name same as the target already exists!"?
I found a post and it seems like the solution doesn't work for me or maybe I miss something.
I'm using custom control which inherited from RadEditor.
I tried to add the following code in the custom control, but rfe is always null.
protected override void EnsureChildControls()
Telerik.Web.UI.RadFileExplorer rfe =
if (rfe != null)
rfe.ItemCommand += new RadFileExplorerEventHandler(radFileExplorer_ItemCommand);
private Control FindRadControl(Control parent)
foreach (Control c in parent.Controls)
if (c is Telerik.Web.UI.RadFileExplorer) return c;
if (c.Controls.Count > 0)
Control sub = FindRadControl(c);
if (sub != null) return sub;
protected void radFileExplorer_ItemCommand(object sender, RadFileExplorerEventArgs e)
//should I check the existence here?