static void CreateServer()
{
    // Create a SQL Database management client
    SqlManagementClient sqlClient = new SqlManagementClient(new TokenCloudCredentials(subscriptionId, token.AccessToken));
    // Create a server
    ServerCreateOrUpdateParameters serverParameters = new ServerCreateOrUpdateParameters()
    {
        Location = location,
        Properties = new ServerCreateOrUpdateProperties()
        {
            AdministratorLogin = administratorLogin,
            AdministratorLoginPassword = administratorPassword,
            Version = serverVersion
        }
    };
        var serverResult = sqlClient.Servers.CreateOrUpdate(resourceGroupName, serverName, serverParameters);
}

static async Task Main(string[] args)
   {
      string tenant_Id = "TenantId";
      string clnt_Id = "ClientId";
      string clnt_Secrt = "Secret";
      string subscrip_Id = "SubscriptionID";
       string resource_GrpName = "Resource Group";
       string server_Name = "myservertest4411";
       string admin_Login = "Rajesh";
       string admin_Pwd = "Password";
       string authenticationUrl = $"https://login.microsoftonline.com/{tenant_Id}/oauth2/token";
       string requestBody = $"grant_type=client_credentials&client_id={clnt_Id}&client_secret={clnt_Secrt}&resource=https://management.azure.com/";
       var content = new StringContent(requestBody, Encoding.UTF8, "application/x-www-form-urlencoded");
       using (var httpClient = new HttpClient())
            {
                var res = await httpClient.PostAsync(authenticationUrl, content);
                string res_Content = await res.Content.ReadAsStringAsync();
                string access_Token = JsonConvert.DeserializeObject<dynamic>(res_Content).access_token;
                string create_ServerUrl = $"https://management.azure.com/subscriptions/{subscrip_Id}/resourceGroups/{resource_GrpName}/providers/Microsoft.Sql/servers/{server_Name}?api-version=2021-02-01-preview";
                string server_RequestBody = $"{{ \"location\": \"eastus\", \"properties\": {{ \"administratorLogin\": \"{admin_Login}\", \"administratorLoginPassword\": \"{admin_Pwd}\", \"version\": \"12.0\" }} }}";
                var server_Req = new HttpRequestMessage(HttpMethod.Put, create_ServerUrl);
                server_Req.Headers.Authorization = new AuthenticationHeaderValue("Bearer", access_Token);
                server_Req.Content = new StringContent(server_RequestBody, Encoding.UTF8, "application/json");
                var server_Resp = await httpClient.SendAsync(server_Req);
                if (server_Resp.IsSuccessStatusCode)
                {
                    Console.WriteLine("SQL Server created successfully!");
                }
                else
                {
                    string errorResponseContent = await server_Resp.Content.ReadAsStringAsync();
                    Console.WriteLine($"Failed to create SQL Server. Error: {errorResponseContent}");
                }
            }
     }