Figure 18-5: The timer component on the Form Designer tray in Visual Studio .NET

Drawing QR Code in Visual Studio .NET Figure 18-5: The timer component on the Form Designer tray

When the Timer component is added, it appears on the tray below the form rather on the form itself (and never appears visibly to the user of an application)

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Choose View Properties Window to open the Properties window In the Properties window, set the Enabled property of the Timer to false by selecting Enabled in the left-hand column and choosing false from the drop-down menu in the right-hand column Now the code in the Tick event of the Timer won t be executed until the program is ready for it, when your program changes the Enabled property to true Set the Interval property of the Timer to 60000 Because the Timer Interval property is expressed in milliseconds, 60000 is equal to 10 minutes and corresponds to the default value in the txtInterval control If you are going to the trouble of storing values over time, I recommend also finding a way to somehow keep those values I ve created a class, TimeValue Trio, which I use to store hit, time, and date information for each keyword Class instances get added to an ArrayList structure, which you can loop through to get to all keyword, time, and hit information The logic of the process is that the structures are created, and initial hit information added, the first time the user clicks the Start button After this happens, the code enables the timer component by setting its Enabled property to true, and setting its Interval property to the value entered into the txtInterval control Each time the interval elapses, the Timer s Tick event fires, and the Google APIs are called again This code is shown in Listing 18-2

Listing 18-2:

private GoogleGoogleSearchService s; private GoogleGoogleSearchResult r; string [] strTerms; private ArrayList al; public class TimeValueTrio { public string keyWord; public string resultCount; public string dateStr; public string timeStr; } private void btnStart_Click(object sender, SystemEventArgs e) { try { s = new GoogleGoogleSearchService(); char delimiter = ; strTerms = txtKeywordsTextSplit(delimiter);

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al = new ArrayList(); for (int i = 0; i < strTermsLength; i++) { r = sdoGoogleSearch(txtDevKeyText, strTerms[i], 0, 1 , false, , false, , , ); TimeValueTrio tvt = new TimeValueTrio(); tvtresultCount = restimatedTotalResultsCountToString(); tvttimeStr = DateTimeNowToShortTimeString(); tvtdateStr = DateTimeNowToShortDateString(); tvtkeyWord = strTerms[i]; alAdd (tvt); txtResultsText += tvtkeyWord + + tvtresultCount + + tvtdateStr+ + tvttimeStr + \r\n ; } timer1Interval = ConvertToInt16 (txtIntervalText) * 60000; //convert to minutes timer1Enabled = true; } catch (SystemWebServicesProtocolsSoapException ex) { MessageBoxShow(exMessage); } catch (Exception excep) { MessageBoxShow (excepMessage); } } private void timer1_Tick(object sender, SystemEventArgs e) { try { for (int i = 0; i < strTermsLength; i++) { r = sdoGoogleSearch(txtDevKeyText, strTerms[i], 0, 1 , false, , false, , , ); TimeValueTrio tvt = new TimeValueTrio(); tvtresultCount = restimatedTotalResultsCountToString(); tvttimeStr = DateTimeNowToShortTimeString(); tvtdateStr = DateTimeNowToShortDateString(); tvtkeyWord = strTerms[i]; alAdd (tvt); txtResultsText += tvtkeyWord + + tvtresultCount + + tvtdateStr+ + tvttimeStr + \r\n ; } } catch (SystemWebServicesProtocolsSoapException ex) {

(continued)

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Listing 18-2 (continued)

MessageBoxShow(exMessage); } catch (Exception excep) { MessageBoxShow (excepMessage); } }

You can t have that Timer running forever! The Enabled property of the Timer component needs to be set to false in the btnStop click event:

private void btnStop_Click(object sender, SystemEventArgs e) { timer1Enabled = false; }

Here s the code that clears the TextBox controls and resets the structures used for storing times and values, placed in the click event procedure associated with the btnClear Button:

private void btnClear_Click(object sender, SystemEventArgs e) { timer1Enabled = false; txtResultsText = ; txtIntervalText = 10 ; txtKeywordsText = ; al = null; strTerms = null; }