Lanap.BotDetect.TextStyleEnum Reference

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Lanap.BotDetect.TextStyleEnum contains all valid values of the Lanap.BotDetect.Captcha control's TextStyle property. It represents the distortion algorithm used for rendering of CAPTCHA images.

TextStyleEnum Members
TextStyleEnum Default
TextStyleEnum Usage
TextStyleEnum Notes
TextStyleEnum Screenshots

Members

[VB.NET]

Public Enum TextStyleEnum
  AncientMosaic
  BlackOverlap
  Bullets
  Bullets2
  CaughtInTheNet
  CaughtInTheNet2
  Chalkboard
  Chess
  Chess3D
  Chipped
  Circles
  Collage
  Corrosion
  CrossShadow
  CrossShadow2
  Cut
  Darts
  Distortion
  FingerPrints
  Flash
  Ghostly
  Graffiti
  Graffiti2
  Halo
  InBandages
  Jail
  Lego
  Mass
  MeltingHeat
  Negative
  Overlap
  Overlap2
  PaintMess
  Rough
  Spiderweb
  Split
  Snow
  Stitch
  Strippy
  SunAndWarmAir
  SunRays
  SunRays2
  ThickThinLines
  ThickThinLines2
  ThinWavyLetters
  Vertigo
  WantedCircular
  Wave
  WavyChess
  WavyColorLetters
End Enum

[C#]

public enum TextStyleEnum
{
  AncientMosaic,
  BlackOverlap,
  Bullets,
  Bullets2,
  CaughtInTheNet,
  CaughtInTheNet2,
  Chalkboard,
  Chess,
  Chess3D,
  Chipped,
  Circles,
  Collage,
  Corrosion,
  CrossShadow,
  CrossShadow2,
  Cut,
  Darts,
  Distortion,
  FingerPrints,
  Flash,
  Ghostly,
  Graffiti,
  Graffiti2, 
  Halo,
  InBandages,
  Jail,
  Lego,
  Mass,
  MeltingHeat,
  Negative,
  Overlap,
  Overlap2,
  PaintMess,
  Rough,
  Spiderweb,
  Split,
  Snow,
  Stitch,
  Strippy,
  SunAndWarmAir,
  SunRays,
  SunRays2,
  ThickThinLines,
  ThickThinLines2,
  ThinWavyLetters,
  Vertigo,
  WantedCircular,
  Wave,
  WavyChess,
  WavyColorLetters
}

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Default value

If the TextStyle property is not set, TextStyleEnum.Chalkboard is used by default.

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Usage

[VB.NET]

' Example 1: simple assignment
SampleCaptcha.TextStyle = TextStyleEnum.Snow

' Example 2: basic randomization
Dim rand As Random = New Random()
Dim max As Integer = _ 
  System.Enum.GetValues(GetType(TextStyleEnum)).Length
SampleCaptcha.TextStyle = CType(rand.Next(max), TextStyleEnum)

' Example 3: basic randomization using RandomizationHelper.vb
SampleCaptcha.TextStyle = _
  RandomizationHelper.GetRandomTextStyle()

' Example 4: advanced randomization using RandomizationHelper.vb
Dim styles As TextStyleEnum() = { _
  TextStyleEnum.Lego, _
  TextStyleEnum.Ghostly, _
  TextStyleEnum.FingerPrints, _
  TextStyleEnum.Graffiti2, _
  TextStyleEnum.Collage _
}

SampleCaptcha.TextStyle = _
  RandomizationHelper.GetRandomTextStyle(styles)

[C#]

// Example 1: simple assignment
SampleCaptcha.TextStyle = TextStyleEnum.Snow;

// Example 2: basic randomization
Random rand = new Random();
int max = Enum.GetValues(typeof(TextStyleEnum)).Length;
SampleCaptcha.TextStyle = (TextStyleEnum)(rand.Next(max));

// Example 3: basic randomization using RandomizationHelper.cs
SampleCaptcha.TextStyle = 
  RandomizationHelper.GetRandomTextStyle();

// Example 4: advanced randomization using RandomizationHelper.cs
TextStyleEnum[] styles = { 
  TextStyleEnum.Lego, 
  TextStyleEnum.Ghostly, 
  TextStyleEnum.FingerPrints, 
  TextStyleEnum.Graffiti2, 
  TextStyleEnum.Collage 
};

SampleCaptcha.TextStyle = 
  RandomizationHelper.GetRandomTextStyle(styles);

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Notes

While some CAPTCHA algorithms always uppercase the random code drawn in the image and some always lowercase it, CAPTCHA validation is always case-insensitive.

You might communicate this fact to your users by automatically uppercasing (or lowercasing) the input as they type. This can be achieved with JavaScript, and can prevent any confusion on the part of the user about how exactly they need to type the CAPTCHA code.

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