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Asked: 2026-05-10T16:54:31+00:00

I have three TextBox controls on the page <asp:TextBox ID=TextBox1 runat=server AutoPostBack=True OnTextChanged=TextBox_TextChanged TabIndex=1>

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I have three TextBox controls on the page

<asp:TextBox ID='TextBox1' runat='server' AutoPostBack='True'         OnTextChanged='TextBox_TextChanged' TabIndex='1'> <asp:TextBox ID='TextBox2' runat='server' AutoPostBack='True'         OnTextChanged='TextBox_TextChanged' TabIndex='2'> <asp:TextBox ID='TextBox3' runat='server' AutoPostBack='True'         OnTextChanged='TextBox_TextChanged' TabIndex='3'>

and an event handler

protected void TextBox_TextChanged(object sender, EventArgs e) {     WebControl changed_control = (WebControl)sender;      var next_controls = from WebControl control in changed_control.Parent.Controls                         where control.TabIndex > changed_control.TabIndex                         orderby control.TabIndex                         select control;      next_controls.DefaultIfEmpty(changed_control).First().Focus(); }

The meaning of this code is to automatically select TextBox with next TabIndex after page post back (see Little JB’s problem). In reality I receive InvalidCastException because it’s impossible to cast from System.Web.UI.LiteralControl (WebControl.Controls contains actually LiteralControls) to System.Web.UI.WebControls.WebControl.

I am interested is it possible to modify this aproach somehow to receive working solution? Thank you!

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1 Answer

  1. OfType

    from control in changed_control   .Parent   .Controls   .OfType<WebControl>()
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