<asp:RangeValidator ID="rvWeight" ForeColor="Red" runat="server" ControlToValidate="txtLoad"  ErrorMessage="Load must be between 0-55000." MinimumValue="0" Type="Integer" MaximumValue="55000"></asp:RangeValidator>
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<asp:RangeValidator ID="rvPackageWeigth" ForeColor="Red" runat="server" ControlToValidate="txtLoadPackage"  ErrorMessage="Package load must be between 0-45000." MinimumValue="0" Type="Integer" MaximumValue="45000"></asp:RangeValidator>