I need to send the value I receive from the model with this link, the proposalName field must be in quotes.How can I do it?

Here is my service url. 

```
   string path = string.Format("{ProposalId:{proposalId},ProposalName:{"proposalName"},VendorId:{vendorId}}",
               Uri.EscapeDataString(proposalId.ToString()),
               Uri.EscapeDataString(proposalName),
               Uri.EscapeDataString(vendorId.ToString()));

```