use Entre button to jump between two textboxes

You should be able to create an event handler method on the button's OnClick event. Inside that method, I believe you could use the "__LASTFOCUS" property to determine which textbox had focus when the button was pressed, and subsequently set the focus to the other text box.

protected void OnClick_EventHandler(object sender, EventArgs e)
{
    string ctrlName = page.Request.Params.Get("__LASTFOCUS");
    Control ctl = Page.FindControl(ctrlName);
 
    if(ctl.GetType() == typeof(TextBox))
    {
        // Here you could make sure the TextBox control
        // is in fact one of the two you wanted, then
        // set the other textbox's focus property
        OtherTextBox.Focus();
    }
}

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Since the enter button will be pressed when the user is in the textbox, should the code not be on the textbox textchanged event.

all working

just needed to know about focus()

thanks