Question

i Want To Set a Tooltip For a TextBox in asp.net when entering Some Text in that textbox.

Answer 1

register following javascript function:

function changeTooltipText(control){
    isNetscape=(document.layers); 
    keyCode = (isNetscape)? keyStroke.which : event.keyCode; 
    newChar = String.fromCharCode(keyCode); 
    if(control!=null){
        control.title=control.value + newChar;
    }
}

register the onkeypress-event on the textbox:

<asp:TextBox ID="TextBox1" onkeypress="changeTooltipText(this)" runat="server"></asp:TextBox>