Basic usage

Page Summary

• Initialize the client library by creating a GoogleAdsConfig object with necessary settings and then using it to create a GoogleAdsClient instance.

• The GoogleAdsClient instance is crucial for creating pre-configured service classes that make API calls.

• Use the GetService method of the GoogleAdsClient instance with the appropriate Services enumeration to create a specific Ads service.

• Handle potential API errors by catching the GoogleAdsException which provides details about the failure.

• Avoid sharing a single GoogleAdsClient instance across multiple threads due to potential configuration conflicts.

• To keep applications responsive when making API calls, consider using the Grpc.Core library for legacy .NET Framework applications or utilizing asynchronous methods.

The basic usage of the .NET client library is as follows:

// Initialize a GoogleAdsConfig instance.
GoogleAdsConfig config = new GoogleAdsConfig()
{
    OAuth2Mode = OAuth2Flow.SERVICE_ACCOUNT,
    OAuth2SecretsJsonPath = "PATH_TO_CREDENTIALS_JSON",
    LoginCustomerId = "INSERT_LOGIN_CUSTOMER_ID_HERE"
};

// Initialize a GoogleAdsClient instance.
GoogleAdsClient client = new GoogleAdsClient(config);

// Create the required service.
CampaignServiceClient campaignService =
    client.GetService(Services.V25.CampaignService);

// Make calls to the service client.

Initialize the client and services

To interact with the Google Ads API, first configure and instantiate a GoogleAdsClient, and then use it to create the specific API service clients you need.

Create a GoogleAdsClient instance

The most important class in the Google Ads API .NET library is the GoogleAdsClient class. It lets you create a pre-configured service client that can be used for making API calls. To configure a GoogleAdsClient object, create a GoogleAdsConfig object and set the required properties. Refer to the Configuration guide to learn more.

Note: Following the September 9, 2026 developer token sunset, API access levels are determined by your Google Cloud project on the API server regardless of client library version (and the developer-token header is ignored by API servers). To omit or remove DeveloperToken from your configuration, use Google.Ads.GoogleAds v27.3.0 or later, which removed local client-side DeveloperToken validation.

// Initialize a GoogleAdsConfig instance.
GoogleAdsConfig config = new GoogleAdsConfig()
{
    OAuth2Mode = OAuth2Flow.SERVICE_ACCOUNT,
    OAuth2SecretsJsonPath = "PATH_TO_CREDENTIALS_JSON",
    LoginCustomerId = "INSERT_LOGIN_CUSTOMER_ID_HERE"
};

// Initialize a GoogleAdsClient instance.
GoogleAdsClient client = new GoogleAdsClient(config);

// Modify the GoogleAdsClient configuration afterwards if needed.
client.Config.LoginCustomerId = "INSERT_UPDATED_LOGIN_CUSTOMER_ID_HERE";

Create a service

GoogleAdsClient provides a GetService method that can be used to create an API service client.

CampaignServiceClient campaignService = client.GetService(
    Services.V25.CampaignService);
// Now make calls to CampaignService.

The library provides a Services class that enumerates all the supported API versions (where minor releases such as v25.1 use their major version enum, Services.V25) and services. The GetService method accepts these enumeration objects as an argument when creating the service. For example, to create an instance of CampaignServiceClient for version V25 of the Google Ads API, call the GoogleAdsClient.GetService method with Services.V25.CampaignService as the argument, as shown in the preceding example.

Error handling

Not every API call succeeds. The server can return errors if your API calls fail for some reason. It is important to capture API errors and handle them appropriately.

A GoogleAdsException instance is thrown when an API error occurs. It contains details to help you figure out what went wrong:

public void Run(GoogleAdsClient client, long customerId)
{
    // Get the GoogleAdsService.
    GoogleAdsServiceClient googleAdsService = client.GetService(
        Services.V25.GoogleAdsService);

    // Create a query that will retrieve all campaigns.
    string query = @"SELECT
                    campaign.id,
                    campaign.name,
                    campaign.network_settings.target_content_network
                FROM campaign
                ORDER BY campaign.id";

    try
    {
        // Issue a search request.
        googleAdsService.SearchStream(customerId.ToString(), query,
            delegate (SearchGoogleAdsStreamResponse resp)
            {
                foreach (GoogleAdsRow googleAdsRow in resp.Results)
                {
                    Console.WriteLine("Campaign with ID {0} and name '{1}' was found.",
                        googleAdsRow.Campaign.Id, googleAdsRow.Campaign.Name);
                }
            }
        );
    }
    catch (GoogleAdsException e)
    {
        Console.WriteLine("Failure:");
        Console.WriteLine($"Message: {e.Message}");
        Console.WriteLine($"Failure: {e.Failure}");
        Console.WriteLine($"Request ID: {e.RequestId}");
        throw;
    }
}
GetCampaigns.cs
      

Thread safety

Modifying the configuration state of a shared GoogleAdsClient instance across multiple threads is not thread-safe, because configuration changes you make on an instance in one thread can affect the services you create on other threads. However, read-only operations like obtaining new service instances from an unchanging GoogleAdsClient instance and making calls to multiple services in parallel are thread-safe.

To isolate per-thread configuration changes, instantiate a separate GoogleAdsClient per worker task or thread:

GoogleAdsClient client1 = new GoogleAdsClient();
GoogleAdsClient client2 = new GoogleAdsClient();

Task task1 = Task.Run(() => AddAdGroups(client1));
Task task2 = Task.Run(() => AddAdGroups(client2));

await Task.WhenAll(task1, task2);

public void AddAdGroups(GoogleAdsClient client)
{
    // Perform operations with client.
}

Keep your application responsive

Google Ads API method calls can take a while to complete, depending on how large the requests are. To keep your application responsive, follow these steps:

Use the Grpc.Core library for legacy UI frameworks

If you are developing an application that targets .NET Framework and uses a legacy UI technology such as ASP.NET Web Forms or WinForms, you can enable the legacy Grpc.Core transport library as follows:

GoogleAdsConfig config = new GoogleAdsConfig();
config.UseGrpcCore = true;
GoogleAdsClient client = new GoogleAdsClient(config);

Use asynchronous methods

You can use asynchronous methods to keep your application responsive. Here are a couple of examples.

Retrieve the list of campaigns and populate a ListView

private async void OnRetrieveCampaignsButtonClick(object sender, EventArgs e)
{
    try
    {
        // Get the GoogleAdsService.
        GoogleAdsServiceClient googleAdsService = client.GetService(
            Services.V25.GoogleAdsService);

        // Create a query that will retrieve all campaigns.
        string query = @"SELECT
                        campaign.id,
                        campaign.name,
                        campaign.network_settings.target_content_network
                    FROM campaign
                    ORDER BY campaign.id";

        List<ListViewItem> items = new List<ListViewItem>();
        await googleAdsService.SearchStreamAsync(
            customerId.ToString(),
            query,
            (SearchGoogleAdsStreamResponse resp) =>
            {
                foreach (GoogleAdsRow googleAdsRow in resp.Results)
                {
                    ListViewItem item = new ListViewItem();
                    item.Text = googleAdsRow.Campaign.Id.ToString();
                    item.SubItems.Add(googleAdsRow.Campaign.Name);
                    items.Add(item);
                }
            }
        );
        listView1.Items.AddRange(items.ToArray());
    }
    catch (GoogleAdsException ex)
    {
        MessageBox.Show($"API Error: {ex.Message}");
    }
}

Update a campaign budget and display a message box alert

private async void OnUpdateBudgetButtonClick(object sender, EventArgs e)
{
    try
    {
        // Get the CampaignBudgetService.
        CampaignBudgetServiceClient budgetService = client.GetService(
            Services.V25.CampaignBudgetService);

        // Create the campaign budget.
        CampaignBudget budget = new CampaignBudget()
        {
            Name = "Interplanetary Cruise Budget #" +
                ExampleUtilities.GetRandomString(),
            DeliveryMethod = BudgetDeliveryMethod.Standard,
            AmountMicros = 500000
        };

        // Create the operation.
        CampaignBudgetOperation budgetOperation = new CampaignBudgetOperation()
        {
            Create = budget
        };

        // Create the campaign budget asynchronously.
        MutateCampaignBudgetsResponse response =
            await budgetService.MutateCampaignBudgetsAsync(
                customerId.ToString(),
                new CampaignBudgetOperation[] { budgetOperation });

        MessageBox.Show(response.Results[0].ResourceName);
    }
    catch (GoogleAdsException ex)
    {
        MessageBox.Show($"API Error: {ex.Message}");
    }
}