Can't able to send json data to C# api in winform

Question

Am unable to post json data to api using c# winform with parameter jsondata, the following steps i used to send data every time i tried same issue raising the code & errors are attached to this post.

 

URL & Datas as follows:

url: https:\\xxx.com\:jsondata

 

Step 1:

 

jsondata=

[{

"Name": "Raj",

"Mobile": "5546546556"

},

{

"Name": "Raj",

"Mobile": "5546546546"

}

]

 

Step 2:

 

jsondata=

{

"Name": "Raj",

"Mobile": "5546546526"

}

 

ERROR:

{"status":"FAILURE","Error":"A JSONObject text must begin with '{' at character 1 of &"}

Error Image:

 

Code in C#:

public static async Task CallInvoiceAPI(string jsondata, string url)
{
try
{
HttpClient client = new HttpClient();
var response = client.PostAsJsonAsync(url, jsondata).Result;
var content = response.Content;
var result = await content.ReadAsStringAsync();
if (result.Contains("SUCCESS"))
strStatus = "Success";
else
strStatus = "Failed";
}
catch (Exception ex)
{
strStatus = "Failed";
}
}