Input string was not in a correct format

public class BorrowerInfoFullDetails
     {
         public decimal TotalLoanAmount { get; set; }
     }

namespace MFCloudAspx
{
    public partial class Borrower : System.Web.UI.Page
    {
       
       public BorrowerInfoFullDetails objBorrowerInfoFullDetails;

        protected void Page_Load(object sender, EventArgs e)
        {
           
            objBorrowerInfoFullDetails = new BorrowerInfoFullDetails();
            
                objBorrowerInfoFullDetails.TotalLoanAmount  = 25000;
   
        }
    }
}

<div class="col-sm-6">
                                    <h2>Rs. <%=string.Format("{0,N}",objBorrowerInfoFullDetails.TotalLoanAmount) %></h2>
                                    <h3><i class="glyphicon glyphicon glyphicon-hand-up"></i>
                                        <br>
                                        Loan Amount</h3>
                                </div>

<%=string.Format("{0,N}",objBorrowerInfoFullDetails.TotalLoanAmount) %><br />
Input string was not in a correct format.