Validation expression for Indian mobile phone number in asp.net c#

For example:-

·         8004561000

·         9044815468

·         9450319996

·         7535154565

Use this expression in regular expression validator

^[7-9][0-9]{9}$

Source Code

 <asp:TextBox ID="txtmobileno" runat="server" Width="180px"></asp:TextBox>

<asp:RegularExpressionValidator ID="REFmoblie" runat="server"

    ErrorMessage="Please enter valid phone no" ControlToValidate="txtmobileno"   ForeColor="Red" style="font-size: small" ValidationExpression="^[7-9][0-9]{9}$"></asp:RegularExpressionValidator>