Problem with range validator Maximum Value property

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C#

ASP.NET

Hello All,

I am using range validator to validate the date but i am having problem with range validator Maximumvalue property:-

The value '19/04/2102' of the MaximumValue property of 'startDateValidator' cannot be converted to type 'Date'.

.aspx code:-

<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
    </asp:ToolkitScriptManager>
 <asp:Label runat="server" ID="lblError" CssClass="AdminError" EnableViewState="false"></asp:Label>

 <asp:RangeValidator ID="startDateValidator" runat="server" ErrorMessage="Invalid Start Date" ControlToValidate="txtStartDate" Display="None" Type="Date"></asp:RangeValidator>

    <asp:RangeValidator ID="endDateValidator" runat="server" Display="None" ErrorMessage="Invalid End Date" ControlToValidate="txtEndDate" MaximumValue="1/1/2100" MinimumValue="1/4/2012" Type="Date"></asp:RangeValidator>

and i am using page_prerender method to define maximum and minimum value , this is my code for .cs page:-

startDateValidator.MinimumValue = DateTime.Now.Date.AddMonths(-1).ToString("dd/MM/yyyy");
     startDateValidator.MaximumValue = (DateTime.Now.Date.AddYears(90).ToString("dd/MM/yyyy"));
endDateValidator.MinimumValue = DateTime.Now.Date.AddMonths(-1).ToString("dd/MM/yyyy");
     endDateValidator.MaximumValue = (DateTime.Now.Date.AddYears(90).ToString("dd/MM/yyyy"));