Error when triggering a build through the TFS API 2010 Beta 2

Question

Hi

I am trying to trigger a build through the TFS API. First, I select the necessary changesets I want, then create a label for them, and then execute a selective build of these changesets. I get the following error message :

TFB210503: An error occurred while initializing a build for build definition \Test\Label Changesets: TF14064: Could not find label abel Demo@$/Test/BuildProcessTemplates/DefaultTemplate.xaml.

where the build definition name is "Label Changesets" and the Label name is "Demo".

Does this mean the label is not getting created successfully? If yes, please tell me how.

I am posting my codes below. Can someone tell me what's wrong??

Thanks, Tara.

/// <summary>

    /// Performs the actual creation of the label for the selected changesets.

    /// </summary>

    /// <param name="selectedChangesets"></param>

    /// <param name="selectedBuild"></param>

    /// <param name="label"></param>

    /// <param name="project"></param>

public void SetLabel(List selectedChangesets, string selectedBuild, string label, string project) { //Initializes a new label with a version number. LabelVersionSpec labelspec = new LabelVersionSpec(selectedBuild); // Get all items in the repository for the specified server path and label spec. ItemSet LabeledItems = tfvc.GetItems(@"$/" + project, labelspec, RecursionType.Full); // Create a array of items labeled with the selected build number. Item[] items = LabeledItems.Items;

        List<int> changesetsInBuild = new List<int>();
        // Add the changesets associated with the items.
        AddNecessaryChangesets(selectedChangesets, items, changesetsInBuild);

        VersionControlLabel labelToCreate;
        List<LabelItemSpec> labelItemSpec;
        //Initialize a representation of a version control label to be sent to the server.
        CreateVersionControlLabel(label, project, out labelToCreate, out labelItemSpec);

        // Actual creation of the label. Remove existing labels, if any.
        try
        {
            LabelResult[] prevResults = tfvc.DeleteLabel(label, "$/" + project);
        }
        catch(Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
        LabelResult[] results = tfvc.CreateLabel(labelToCreate, labelItemSpec.ToArray(), LabelChildOption.Replace);
    }

///

    /// Initializes a label in version control. 

    /// </summary>

    /// <param name="label">The user supplied label</param>

    /// <param name="project">The team project name</param>

    /// <param name="labelToCreate">The version control label</param>

    /// <param name="labelItemSpec">A list of label items</param>

private void CreateVersionControlLabel(string label, string project, out VersionControlLabel labelToCreate, out List labelItemSpec) { labelToCreate = new VersionControlLabel(tfvc, label, tfvc.AuthenticatedUser, "$/" + project, "DemoLabel");

        // Create Labeled Items and Remove items of build configuration files.
        labelItemSpec = new List<LabelItemSpec>();
        for (int i = 0; i < changeSets.Count; i++)
        {
            foreach (Change change in tfvc.GetChangeset(changeSets[i]).Changes)
            {
                // As long as the changes are not related to Team Build Types/build Definitions...
                if (!change.Item.ServerItem.Contains("BuildDefinitions"))
                //if (!change.Item.ServerItem.Contains("TeamBuildTypes"))
                {
                    // Create source control version of the label.
                    ItemSpec changesetItemSpec = new ItemSpec(change.Item.ServerItem, RecursionType.Full);
                    labelItemSpec.Add(new LabelItemSpec(changesetItemSpec, new ChangesetVersionSpec(changeSets[i]), false));
                }
            }
        }
    }

/// /// Trigger a build of the labeled items. /// /// Label for the build /// Success/failure of the build public bool TriggerLabeledBuild(string label) { try { // Add the obtained changesets to the list. List BuildChangesets = new List(); foreach (int cs in changeSets) { BuildChangesets.Add(tfvc.GetChangeset(cs)); }

            // Get the Build Definition Object.
            IBuildDefinition buildDef = bs.GetBuildDefinition(project, selectedBuildType);

            // Create a Build Request object.
            IBuildRequest request = buildDef.CreateBuildRequest();
            // Specify that we want a labelled version of the build.
            request.GetOption = GetOption.Custom;
            request.CustomGetVersion = "Label Demo";

            // Queue our build.
            queuedbuild = bs.QueueBuild(request);

            // Get the build details of the Queued Build so that we can associate the changesets to it.
            build = queuedbuild.Build;
            // Associate the non-default changesets to the build.
            List<IChangesetSummary> assocChangesets = InformationNodeConverters.AddAssociatedChangesets(build, BuildChangesets.ToArray());

            // Start a timer for the build.
            timer = new System.Timers.Timer(5000);
            timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
            timer.Start();
            return true;
        }
        catch(Exception ex)
        {
            MessageBox.Show(ex.Message);
            return false;
        }
    }