C#NET2008 Delegate Class Methods not working

CODING FROM FrmMAIN.CS 

private void btnCalculate_Click(object sender, EventArgs e)
        {
            if ((this.txtLoanAmt.TextLength != 0) &&  (this.txtIntRate.TextLength !=0)) 
            {
                txtAmt = Convert.ToDouble(this.txtLoanAmt.Text);
                txtInt = Convert.ToDouble(this.txtIntRate.Text);   
                 
                  clsDelegate = new ClassDelegateCalculate.DelegateCalculate(txtAmt, txtInt) ;
                  this.intTotalLoan = clsDelegate.propCalculate;   <-----Error from here ******
                  intPayMth = (intTotalLoad /= 12);
                  
                  this.lblTotalLoan.Text = Convert.ToString(intTotalLoan);
                  this.lblPayMth.Text = Convert.ToString(intPayMth);
            }
        }

 

namespace CSharpDelegate
{
    class ClassDelegateCalculate
    {
                //declare the DelegateCalculatonClass
                public delegate double DelegateCalculate(double LoanAmt, double interest);
                private double dblLoanAmt;
                private double dblInterest;
        
                //------ constructor normal  --------------
                public ClassDelegateCalculate()
                {
                    this.dblLoanAmt = 0;
                    this.dblInterest = 0;            
                 }

                //----- constructor override ------------------------------------
                public ClassDelegateCalculate(double Loan, double YearInt)
                {
                    this.dblLoanAmt =  Loan;
                    this.dblInterest = YearInt;                           
                }
                
                //--------class methods -------------------------------------
                public Double propCalculate()
                    //return variable back to calling Program FrmMain
                {
                    //calculate interest on loan amount   
                    double dblTotalAmt;
                     this.dblTotalAmt =  (  (this.dblLoanAmt *  this.dblInterest) /= 100);     
                     return (dblTotalAmt);  
                }
                                    
    }
}