Xamarin Progress Bar c#

Question

 

I have made a ProgressDialog that should appear immediately before a web service call or some data loading in Button click event

  

 

Please see below codes,

 

addTask = FindViewById<Button>(Resource.Id.myButton);
addTask.Click += (sender, e) => {

                progress = new Android.App.ProgressDialog(this);
                progress.Indeterminate = true;
                progress.SetProgressStyle(Android.App.ProgressDialogStyle.Spinner);
                progress.SetMessage("Loading... Please wait...");
                progress.Show();

XmlSerializer xm=new XmlSerializer(typeof(n107_180_68_111.BizInfoFinderSearchResults));

                StringWriter writer = new StringWriter();
                xm.Serialize(writer, result1);
                string xmlContent = writer.ToString();
XmlDocument doc = new XmlDocument();
                doc.LoadXml(xmlContent);
                doc.Save(Console.Out);
                try
                {


                    XmlNodeList siteResults = doc.GetElementsByTagName("SiteResults");

                    bool titleRow = true;

                    if (!object.ReferenceEquals(siteResults, null))
                    {
                        XmlNodeList siteSearchResults = siteResults[0].ChildNodes;
                        int count = siteSearchResults.Count;
                        for (int i = 0; i < count; i++)
                        {
                            if (!object.ReferenceEquals(siteSearchResults, null))
                            {
                                foreach (XmlNode siteSearchResult in siteSearchResults)
                                {
                                    if (siteSearchResult.InnerText != null)
                                    {
                                        string siteID = siteSearchResult.ChildNodes[0].InnerText.Trim();
                                        int totalhits = Convert.ToInt32(siteSearchResult.ChildNodes[5].InnerText.Trim());
                                        XmlNode results = siteSearchResult.ChildNodes[7];
                                        titleRow = true;
                                        finalResults[i] = new DataTable();
                                        if (!object.ReferenceEquals(results, null))
                                        {
                                            int rowIndex = 0;

                                            foreach (XmlNode result in results.ChildNodes)
                                            {
                                                if (titleRow)
                                                {
                                                    foreach (XmlNode col in result.ChildNodes)
                                                    {
                                                        finalResults[i].Columns.Add(col.InnerText.Trim());
                                                    }
                                                    finalResults[i].Columns.Add("SiteID");
                                                    finalResults[i].Columns.Add("TotalHits");
                                                    titleRow = false;
                                                }
                                                else
                                                {
                                                    if (rowIndex > 0)
                                                    {
                                                        int colIndex = 0;
                                                        DataRow row = finalResults[i].NewRow();

                                                        foreach (XmlNode col in result.ChildNodes)
                                                        {
                                                            row[colIndex] = col.InnerText.Trim();
                                                            colIndex++;
                                                        }
                                                        row[colIndex] = siteID;
                                                        row[colIndex + 1] = totalhits;
                                                        finalResults[i].Rows.Add(row);
                                                    }
                                                }
                                                rowIndex++;
                                            }
                                        }
                                        i++;
                                    }
                                    else
                                    {
                                        count--;
                                    }
                                }



                                for (int j = 0; j < count; j++)
                                {
                                    finalResults[0].Merge(finalResults[j]);
                                    finalResults[0].Columns["Name"].SetOrdinal(0);
                                }
                            }
                        }
                    }
                    if (!finalResults[0].Columns.Contains("Status"))
                    {
                        finalResults[0].Columns.Add(new DataColumn("Status", typeof(String)));
                    }
                    if (!finalResults[0].Columns.Contains("DetailUri"))
                    {
                        finalResults[0].Columns.Add(new DataColumn("DetailUri", typeof(String)));
                    }
                    if (!finalResults[0].Columns.Contains("Score"))
                    {
                        finalResults[0].Columns.Add(new DataColumn("Score", typeof(Double)));
                    }
                    if (finalResults[0].Columns.Contains("Type"))
                    {
                        if (!finalResults[0].Columns.Contains("Status"))
                        {
                            finalResults[0].Columns["Type"].ColumnName = "Status";
                        }
                    }
                    if (finalResults[0].Columns.Contains("EntityName"))
                    {
                        if (!finalResults[0].Columns.Contains("Name"))
                        {
                            finalResults[0].Columns["EntityName"].ColumnName = "Name";
                        }
                    }
                    foreach (DataRow row in finalResults[0].Rows) // Loop over the rows.
                    {
                        string name = row["Name"].ToString().ToLower();

                        string keyword = et1.Text.ToString().ToLower();
                        double score = System.Math.Round((GOATechnologies.Tools.StringMatch.Match(name, keyword) * 100), 2);
                        row["Score"] = score;
                    }
                }

                catch(Exception ex) {
                    string msg = ex.Message;
                }

                dt = finalResults [0];
                MylistViewAdapter adapter=new MylistViewAdapter(this,businesslist);				               lv1.Adapter = adapter;                progress.Hide();

please advice..