Please check the following code:
<script language="javascript" type="text/javascript">
function onover()
{
// alert("over");
document.getElementById('<%=Label1.ClientID%>').style.display="inline";
}
function onout()
{
//alert("out");
document.getElementById('<%=Label1.ClientID%>').style.display="none";
}
</script>
<form id="form1" runat="server">
<asp:Label ID="Label1" runat="server" Text="show"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server" onmouseover="javascript:onover();" onmouseout="javascript:onout();"></asp:TextBox>
</form>
Working perfectly as per your requirement.
Please check and let me know.
mark it solution if you got your answer, so that other can refer the solution.
Thanks
Ashish