| Class | Description | |
|---|---|---|
 | TwainAcquireMultiPageEventArgs | Provides data for the TwainSession.AcquireMultiPage event. |
| TwainAcquirePageEventArgs | Provides data for the TwainSession.AcquirePage event. |
| TwainArrayCapability | Represents a container of type TW_ARRAY. |
| TwainCapability | Provides properties for getting and setting information about the capability type and the container type. |
| TwainCapabilityBase | The TwainCapabilityBase Class provides support for getting and setting information about the capability type and the container type. |
| TwainDeviceEvent | Provides information about the Event that was raised by the Source. The Source should only fill in those fields applicable to the Event. The Application must only read those fields applicable to the Event. |
| TwainEnumerationCapability | Represents a container of type TW_ENUMERATION. |
| TwainException | The exception that is thrown when a TWAIN error occurs. |
| TwainExtraImageInformation | Provides support for getting extra image information. |
| TwainFastConfigurationEventArgs | Provides data for the TwainSession.FastConfiguration event. |
| TwainFileSystem | Provides Twain file system information for the current selected data source |
| TwainInformation | Provides support for handling extended image information. |
| TwainOneValueCapability | Represents a container of type TW_ONEVALUE. |
| TwainRangeCapability | Represents a container of type TW_RANGE. |
| TwainSession | The TwainSession provides basic support for Twain scanning functionality. |
| TwainSetPropertyEventArgs | Provides data for each TWAIN property set by calling TwainSession.Properties property. |
| TwainTemplateEventArgs | Provides data for the TwainSession.SaveTemplate and TwainSession.LoadTemplate events. |
| Structure | Description | |
|---|---|---|
 | TwainAcquirePageOptions | Provides TwainAcquirePageOptions for the current selected data source. |
| TwainDataTransferProperties | Provides data transfer information for the current selected data source. |
| TwainElement8 | Provides Twain element data. |
| TwainFastConfiguration | (Document/Medical only) Provides information about a scan configuration to be tested or a scan configuration that is the result of testing. |
| TwainFindFastConfigurationResult | (Document/Medical only) Encapsulates an array of TwainFastConfiguration objects that represent the scan configurations tested. |
| TwainFrame | Provides functionality for getting and setting information about the area of the image to acquire. |
| TwainImageEffects | Provides TwainImageEffects for the current selected data source. |
| TwainImageEffectsProperties | Provides image effects information for the current selected data source. |
| TwainImageResolutionProperties | Provides image resolution information for the current selected data source. |
| TwainJpegCompression | Provides information about the TWAIN file JPEG compression options for the currently selected data source. |
| TwainMemoryData | Provides Twain memory data |
| TwainProperties | Provides TWAIN properties for the current selected data source. |
| TwainSourceInformation | Provides information about a TWAIN Data Source. |
| TwainTransferOptions | Provides transfer options for the current selected data source. |
| Enumeration | Description | |
|---|---|---|
 | SaveCapabilityOptions | Specifies whether all of possible capability values, current values, or default values are saved to disk. |
| TwainCapabilityType | Indicates the capability that is being retrieved or set. |
| TwainCapabilityValue | Possible values for Twain Capability. |
| TwainColorScheme | Represents color scheme for Twain |
| TwainCompressionMode | Represents TWAIN compress mode |
| TwainConditionCode | The condition code constants for retrieving the extended image information. |
| TwainContainerType | Indicates the container type used in getting the capabilities' values. |
| TwainCountry | The TwainCountry enumerated type represents the possible values to be used in TwainSession.Startup2 |
| TwainDataTransferFillOrder | Represents the TWAIN data transfer fill order |
| TwainDuplexScanningMode | Represents TWAIN duplex scanning mode |
| TwainExceptionCode | Used as a value for TwainException.Code property. |
| TwainExtendedImage | The extended image information ID constants. |
| TwainFastUserInterfaceFlags | (Document/Medical only) Indicates whether to display the manufacturer's user interface and whether to use Thread mode in Fast Twain. |
| TwainFileFormat | Represents Twain file format |
| TwainFileSystemMessage | The TwainFileSystemMessage enumerated type represents the possible messages will be used in Twain File System. |
| TwainGetCapabilityMode | Indicates the capability values to get. |
| TwainImageEffectsFlags | The TwainImageEffectsFlags enumerated type represents specific image effects. |
| TwainImagePixelFlavor | Represents TWAIN image pixel flavor |
| TwainImageUnit | Represents Twain image unit. |
| TwainItemType | Indicates the type of data contained in the extended image information. |
| TwainLanguage | The TwainLanguage enumerated type represents the possible values to be used in TwainSession.Startup2 |
| TwainMemoryDataFlags | The TwainMemoryDataFlags enumerated type represents the possible values to be used in TwainMemoryData.Flags property. |
| TwainPaperOrientation | Represents TWAIN paper orientation |
| TwainPaperSize | Represents TWAIN paper size |
| TwainReturnCode | The return code constants for retrieving the extended image information. |
| TwainRgbResponseFlags | The TwainRgbResponseFlags enumerated type represents the possible values to be used in the ModifyRGBResponse method. |
| TwainSetCapabilityMode | Indicates whether to set or reset the capability value. |
| TwainStartupFlags | Flags used with TwainSession.Startup method |
| TwainTransferMechanism | Indicates the transfer type. |
| TwainTransferMode | The TwainTransferMode enumerated type represents the possible transfer modes. |
| TwainUserInterfaceFlags | Indicates whether to display the manufacturer's user interface. |
| TwainVersion | The TwainVersion enumerated type represents the possible Twain versions you can set via TwainSession.SetVersion. |
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