How to check if a texbox has only numbers.

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convert

text

parsing

I have a textbox 'Mobile'. I'm using a C# code to check if the entered value is a number or not. But it only checks upto 9 digits. And I want 10 digits to be checked i.e. Mobile Number.

aspx

<asp:TextBox ID="Mobile" runat="server" BorderColor="Black" class="textbox" Style="text-transform:uppercase" Width="80px" MaxLength="10">


C#

int parsedValue;
if (!int.TryParse(Mobile.Text, out parsedValue))
{
Label lbl1 = new Label();
lbl1.Text = "Please Enter only Numbers in Mobile No.";
ScriptManager.RegisterStartupScript(this,this.GetType(),"ShowSuccess","javascript:Showalert('" + lbl1.Text + "')",true);
return;
}