C#

public class SpecialTextboxCasing : Behavior<TextBox>
{
  protected override void OnAttached()
  {
    base.OnAttached();   
    AssociatedObject.PreviewTextInput += AssociatedObject_PreviewTextInput;
    DataObject.AddPastingHandler(AssociatedObject, OnClipboardPaste);
  }

  protected override void OnDetaching()
  {
    base.OnDetaching();
    AssociatedObject.PreviewTextInput -= AssociatedObject_PreviewTextInput;
    DataObject.RemovePastingHandler(AssociatedObject, OnClipboardPaste);
  }

  private void OnClipboardPaste(object sender, DataObjectPastingEventArgs dopea)
  {
    // Do something...
  }

  void AssociatedObject_PreviewTextInput(object sender, TextCompositionEventArgs e)
  {
    // Do something...
  }
}

void textBox1_KeyPress(object sender, KeyPressEventArgs e)
     {
         if (e.KeyChar.ToString() == e.KeyChar.ToString().ToUpper())
         {
             MessageBox.Show("Only Small Letters are Permitted");
             e.Handled = true;
         }

     }

e.KeyChar = e.KeyChar.ToString().ToLower().ToCharArray()[0];

<?xml version="1.0" encoding="utf-8" ?>
  <configuration>
    <configSections>
      <sectionGroup name="Groups" >
        <section name="Group1" type="System.Configuration.NameValueSectionHandler" />
        <section name="Group2" type="System.Configuration.NameValueSectionHandler" />
        <section name="Group3" type="System.Configuration.NameValueSectionHandler" />
      </sectionGroup>
      <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
      </sectionGroup>
    </configSections>
    <Groups>
      <Group1>
        <add key="System 1" value="192.168.0.3" />
      </Group1>
      <Group2>
        <add key="System 2" value="192.168.0.1" />
        <add key="System 3" value="192.168.0.2" />
      </Group2>
      <Group3>
        <add key="key1" value="value1" />
        <add key="key2" value="value2" />
      </Group3>
    </Groups>
    <userSettings>
        <setting name="LastGroup" serializeAs="String">
          <value>Group1</value>
        </setting>
    </userSettings>
</configuration>

<GroupManager>
    <Groups>
        <Group GroupName="Group 1">
            <System Name="System 1">192.168.0.1</System>
        </Group>
        <Group GroupName="Group 2">
            <System Name="System 2">192.168.0.2</System>
        </Group>
    </Groups>
</GroupManager>

byte[] data = new byte[size];
[...].unsafe{
  fixed (byte* ptr = data) {
    [...]
    for (int i = 0; i < size; i++)
      ptr[i] = 128;
    [...]
  }
}

byte[] data = new byte[size];
[...].for (int i = 0; i < size; i++)
   data[i] = 128;

byte* ptr = data;
byte* ptrEnd = data;
ptrEnd += (size - (size % 10));
while (ptr != ptrEnd)
{
    *ptr = 128; ptr++;
    *ptr = 128; ptr++;
    *ptr = 128; ptr++;
    *ptr = 128; ptr++;
    *ptr = 128; ptr++;
    *ptr = 128; ptr++;
    *ptr = 128; ptr++;
    *ptr = 128; ptr++;
    *ptr = 128; ptr++;
    *ptr = 128; ptr++;
}
ptrEnd += (size % 10);
while(ptr != ptrEnd)
{
    *ptr = 128; ptr++;
}

*(++ptr) = 128;   // Maybe this?
*(ptr++) = 128;   // Or was it this?

Array.Copy(data, 0, length, data, length, length);