public ExpenseRepository(TimeSpan sharedSignatureValiditySpan)
 {
     this.account        = CloudConfiguration.GetStorageAccount(AzureConnectionStrings.DataConnection);
     this.receiptStorage = new ExpenseReceiptStorage();
     this.sharedSignatureValiditySpan = sharedSignatureValiditySpan;
 }
 public ExpenseRepository(TimeSpan sharedSignatureValiditySpan)
 {
     this.account = CloudConfiguration.GetStorageAccount(AzureConnectionStrings.DataConnection);
     this.receiptStorage = new ExpenseReceiptStorage();
     this.sharedSignatureValiditySpan = sharedSignatureValiditySpan;
 }