Hi kid.live,

Refer below link.

Read JSON data from URL and Populate DropDownList using C# and VB.Net in ASP.Net

Finally Done. 

private void GetPetrolStationList()
{
    ServicePointManager.Expect100Continue = true;
    ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;
    string strKey = System.Configuration.ConfigurationManager.AppSettings["ApiKey"].ToString();
    string json = (new WebClient() { Encoding = System.Text.Encoding.UTF8 }).DownloadString($"http://210.255.200.204:804/api/Station/GetPetrolStationList?ApiKey={strKey}");
    List<Dictionary<string, dynamic>> values = JsonConvert.DeserializeObject<List<Dictionary<string, dynamic>>>(json);
    ddlBranches.Items.Insert(0, new ListItem { Text = "الكل", Value = "0" });

    for (int i = 0; i < values.Count; i++)
    {
         ddlBranches.Items.Add(new ListItem(values[i]["StationName_Arabic"].ToString(), values[i]["StationId"].ToString()));
    }
}