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RICHTEXT BOX

CODE:

Public Class Form1Private Sub btnBoldAndItalic_Click( ByVal sender As System.Object, ByVal e As

System.EventArgs) Handles btnBoldAndItalic.ClickrtxtBoldAndItalic.SelectionStart = rtxtBoldAndItalic.Find( "will" )Dim ifont As New Font(rtxtBoldAndItalic.Font, FontStyle.Italic)rtxtBoldAndItalic.SelectionFont = ifontrtxtBoldAndItalic.SelectionStart = rtxtBoldAndItalic.Find( "way" )Dim bfont As New Font(rtxtBoldAndItalic.Font, FontStyle.Bold)rtxtBoldAndItalic.SelectionFont = bfont

End Sub

Private Sub btnFontColor_Click( ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnFontColor.Click

rtxtFontColor.Text = rtxtBoldAndItalic.TextrtxtFontColor.SelectionStart = rtxtFontColor.Find( "will" )rtxtFontColor .SelectionColor = Color.BluertxtFontColor .SelectionStart = rt xtFontColor.Find( "way" )rtxtFontColor .SelectionColor = Color.BurlyWood

End SubEnd Class

FORM DESIGN:

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OUTPUT:

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DESCRIPTION:

RichTextBoxes are similar to textboxes but they provide some advanced features over the standard

toolbox. RichTextBox allows formatting the text, say adding colors, displaying particular font types andso on. The RichTextBox, like the TextBox is based on the TextBoxBase class which is based onthe Control class.

To set colors in a rich text box, you can make a selection using the property SelectionStart andset the rich text box's SelectionColor property. One way to set colors in VB .NET is with the Colors enumeration, using colors such as Colors.Red , Colors.Green , and so on. The particular word can beselected using the find () method.

Enter some text in the RichTextBox and the click event of btnBoldAndItalic . Thefollowing code will search for text we mentioned in code and sets it to be display as Bold or Italic basedon what text is searched for. Similarly when the btnFontColor event is clicked, code will searchfor text we mentioned in code and sets it to be display in Font floor based on what text is searched for.

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PERFORMANCE COUNTER

Private counter As PerformanceCounter

Private Sub btnDecrementCounter_Click( ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDecrementCounter.Click

Trycounter.ReadOnly = False

If counter.RawValue > 0 Thencounter.Decrement()ToolStripStatusLabel1.Text = ""

ElseToolStripStatusLabel1.Text = "Counter is already zero."

End IfCatch exc As Exception

ToolStripStatusLabel1.Text = "Could not decrement counter."End Try

End Sub

Private Sub btnIncrementCounter_Click( ByVal sender As System.Object, ByVal e As

System.EventArgs) Handles btnIncrementCounter.Click

Trycounter.ReadOnly = Falsecounter.Increment()ToolStripStatusLabel1.Text = ""

CatchToolStripStatusLabel1.Text = "Could not increment counter."

End TryEnd Sub

Private Sub btnRefreshCategories_Click( ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRefreshCategories.Click

Me.cboCategories.Items.Clear()Me.cboCounters.Items.Clear()Me.counter = NothingMe.txtBuiltInOrCustom.Text = ""Me.txtCounterHelp.Text = ""Me.txtCounterType.Text = ""Me.txtCounterValue.Text = ""Me.btnDecrementCounter.Enabled = FalseMe.btnIncrementCounter.Enabled = FalseMe.cboCategories.Text = ""Me.cboCounters.Text = ""Me.Form1_Load( Me, New System.EventArgs())

End Sub

Private Sub cboCategories_SelectedIndexChanged( ByVal sender As System.Object, ByVal e

As System.EventArgs) Handles cboCategories.SelectedIndexChanged

Dim category As PerformanceCounterCategoryDim counters As New ArrayList()Dim thisCounter As PerformanceCounterDim counterNames() As String

If cboCategories.SelectedIndex -1 ThenTry

category = New PerformanceCounterCategory( _Me.cboCategories.SelectedItem.ToString())

counterNames = category.GetInstanceNames()

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If counterNames.Length = 0 Thencounters.AddRange(category.GetCounters())

ElseDim i As IntegerFor i = 0 To counterNames.Length - 1

counters.AddRange( _category.GetCounters(counterNames(i)))

NextEnd If

Me.cboCounters.Items.Clear()Me.cboCounters.Text = ""For Each thisCounter In counters

Me.cboCounters.Items.Add( New CounterDisplayItem(thisCounter))Next

Catch exc As Exception

MsgBox( "Unable to list the Counters in this Category." + _"Please select another Category." )

End Try

End IfEnd Sub

Private Sub cboCounters_SelectedIndexChanged( ByVal sender As System.Object, ByVal eAs System.EventArgs) Handles cboCounters.SelectedIndexChanged

Dim displayItem As CounterDisplayItemTry

displayItem = CType (cboCounters.SelectedItem, Cou nterDisplayItem)counter = displayItem.Counter

Me.txtCounterType.Text = counter.CounterType.ToString()Me.txtCounterHelp.Text = counter.CounterHelp.ToString()ToolStripStatusLabel1.Text = ""

If displayItem.IsCustom ThenMe.txtBuiltInOrCustom.Text = "Custom"Me.btnDecrementCounter.Enabled = TrueMe.btnIncrementCounter.Enabled = True

ElseMe.txtBuiltInOrCustom.Text = "Built-In"Me.btnDecrementCounter.Enabled = FalseMe.btnIncrementCounter.Enabled = False

End If

Catch exc As Exceptioncounter = Nothing

End TryEnd Sub

Private Sub Form1_Load( ByVal sender As System.Object, ByVal e As System.EventArgs)Handles MyBase .Load

Dim category As PerformanceCounterCategoryDim categories() As PerformanceCounterCategorycategories = Performa nceCounterCategory.GetCategories()

Dim categoryNames(categories.Length - 1) As StringDim i As Integer = 0 ' Used as a counter

For Each category In categoriescategoryNames(i) = category.CategoryName

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i += 1NextArray.Sort(categoryNames)

Dim nameString As StringFor Each nameString In categoryNames

Me.cboCategories.Items.Add(nameString)Next

Me.tmrUpdateUI.Interval = 500Me.tmrUpdateUI.Enabled = True

End SubPrivate Sub tmrUpdateUI_Tick( ByVal sender As System.Object, ByVal e As

System.EventArgs) Handles tmrUpdateUI.TickTry

If Not counter Is Nothing ThenMe.txtCounterValue.Text = counter.NextValue().ToString()

End IfCatch exc As Exception

Me.txtCounterValue.Text = ""End Try

End Sub

End Class

FORM DESIGN

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OUTPUT SCREEN

Initiate the performance counter with your Manually Created Performance counter

After refreshing it and choosing the Processor Category

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DESCRIPTION:

P erformance Counters are Windows OS objects that capture metrics about the performance of hardware and applications. For example, performance counters can capture performance metrics forprocessors, memory, threads, events, and processes. Metrics can be used to detect problems or to

tune applications and hardware for maximum performance.

P erformance Counter objects may be accessed programmatically or with the Windows P erformanceMonitor Application ( P erfMon).

y L isting categories P erformance counter categories are retrieved using the GetCategoriesmethod and displayed in a ComboBox control.

y L isting counters P erformance counters are retrieved using the GetCounters method anddisplayed in a ComboBox control. Only the counters from the selected category are retrieved.

y Retrieving data The NextValue method is used to retrieve the current value of the selectedcounter.

y Custom counters The application only allows you to increment custom counters. A customcounter is defined as a counter where you cannot call the NextValue method.