Take the following steps to start a project and to add some code to obtain a Twain Capability:

1. Start Visual Studio .NET.
2. Choose File->New->Project… from the menu.
3. In the New Project dialog box, choose either "Visual C# Projects" or "Visual Basic Projects" in the Projects Type List, and choose "Windows Application " in the Templates List.
4. Type the project name as "GetTwainCapability" in the Project Name field, and then choose OK. If desired, type a new location for your project or select a directory using the Browse button, and then click OK .
5. In the "Solution Explorer" window, right-click on the "References" folder, and select "Add Reference…" from the context menu. In the "Add Reference" dialog box, select the ".NET" tab and browse to Leadtools For .NET "<LEADTOOLS_INSTALLDIR>\Bin\DotNet\Win32 " folder and select the following DLLs:
   • Leadtools.dll
   • Leadtools.Twain.dll
   • Leadtools.Codecs.dll
   • Leadtools.WinForms.dll
   Click the Select button and then click the OK button to add the above DLLs to the application.
6. Go to the toolbox (View->Toolbox) and drag and drop 4 instances of the Button control to the top of the form and set the following properties for them:

   Text	Name
   Select Source	buttonSelectSource
   Use Capability	buttonUseCapability
   Set Brightness	buttonSetBrightness
   Acquire	buttonAcquire

7. Switch to Form1 code view (right-click Form1 in the solution explorer then select View Code ) and add the following lines at the beginning of the file:

   [Visual Basic]

               Imports Leadtools 
               Imports Leadtools.Twain 
               Imports Leadtools.Codecs 
               Imports Leadtools.WinForms
               
   

8. Declare the following private variable:

   [Visual Basic]

               Private WithEvents twnSession As TwainSession
               
   

   [C#]

               private TwainSession twnSession;
               
   

9. Add an event handler to the Form1 Load event and code it as follows:

   [Visual Basic]

               Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 
                  Try 
                     ' Unlock Document support. 
                     ' Note that this is a sample key, which will not work in your toolkit. 
                     RasterSupport.Unlock(RasterSupportType.Document, "TestKey") 
                     twnSession = new TwainSession 
                     twnSession.Startup(Me, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None) 
                  Catch ex As Exception 
                     MessageBox.Show(ex.Message) 
                  End Try 
               End Sub
               
   

   [C#]

               private void Form1_Load(object sender, System.EventArgs e) 
               { 
                  try 
                  { 
                     // Unlock Document support. 
                     // Note that this is a sample key, which will not work in your toolkit. 
                     RasterSupport.Unlock(RasterSupportType.Document, "TestKey"); 
                     twnSession = new TwainSession(); 
                     twnSession.Startup(this, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None);
                  } 
                  catch (Exception ex) 
                  { 
                     MessageBox.Show(this, ex.Message); 
                  } 
               }
               
   

10. Add an event handler to the Form1 Closing event and code it as follows:

    [Visual Basic]

                Private Sub Form1_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing 
                   Try   
                      twnSession.Shutdown() 
                   Catch ex As Exception 
                      MessageBox.Show(ex.Message) 
                   End Try 
                End Sub
                
    

    [C#]

                private void Form1_FormClosing(object sender, FormClosingEventArgs e) 
                { 
                   try 
                   { 
                      twnSession.Shutdown();
                   } 
                      catch (Exception ex)
                   {
                      MessageBox.Show(this, ex.Message);
                   } 
                }
                
    

11. Add an event handler to the buttonSelectSource Click event and code it as follows:

    [Visual Basic]

                Private Sub buttonSelectSource_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonSelectSource.Click 
                   Try 
                      twnSession.SelectSource(String.Empty) 
                   Catch ex As Exception 
                      MessageBox.Show(ex.Message) 
                   End Try 
                End Sub
                
    

    [C#]

                private void buttonSelectSource_Click(object sender, System.EventArgs e)
                { 
                   try 
                   { 
                      twnSession.SelectSource(string.Empty);
                   } 
                   catch (Exception ex)
                   { 
                      MessageBox.Show(this, ex.Message);
                   }
                }
                
    

12. Add an event handler to the buttonUseCapability Click event and code it as follows:

    [Visual Basic]

                Private Sub buttonUseCapability_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonUseCapability.Click 
                   Try 
                      Dim twGetCapability As TwainCapability = twnSession.GetCapability(TwainCapabilityType.ImageTransferMechanism, TwainGetCapabilityMode.GetCurrent) 
                      If twGetCapability.Information.ContainerType = TwainContainerType.OneValue Then 
                         Dim capValue As TwainCapabilityValue = twGetCapability.OneValueCapability.Value 
                         If capValue <> TwainCapabilityValue.TransferMechanismFile Then 
                            Dim twSetCapability As TwainCapability 
                            twSetCapability = new TwainCapability 
                            twSetCapability.Information.ContainerType = TwainContainerType.OneValue 
                            twSetCapability.Information.Type = TwainCapabilityType.ImageTransferMechanism 
                            twSetCapability.OneValueCapability.ItemType = TwainItemType.Uint16 
                            twSetCapability.OneValueCapability.Value = TwainCapabilityValue.TransferMechanismFile 
                            twnSession.SetCapability(twSetCapability, TwainSetCapabilityMode.Set) 
                         End If 
                      End If 
                   Catch ex As Exception 
                      MessageBox.Show(ex.Message) 
                   End Try 
                End Sub
                
    

    [C#]

                private void buttonUseCapability_Click(object sender, System.EventArgs e)
                { 
                   try 
                   { 
                      TwainCapability twGetCapability = twnSession.GetCapability(TwainCapabilityType.ImageTransferMechanism, TwainGetCapabilityMode.GetCurrent); 
                      
                      if (twGetCapability.Information.ContainerType == TwainContainerType.OneValue) 
                      { 
                         TwainCapabilityValue capValue = (TwainCapabilityValue)twGetCapability.OneValueCapability.Value; 
                         if (capValue != TwainCapabilityValue.TransferMechanismFile) 
                         { 
                            TwainCapability twSetCapability; 
                            twSetCapability = new TwainCapability(); 
                            twSetCapability.Information.ContainerType = TwainContainerType.OneValue; 
                            twSetCapability.Information.Type = TwainCapabilityType.ImageTransferMechanism; 
                            twSetCapability.OneValueCapability.ItemType = TwainItemType.Uint16; 
                            twSetCapability.OneValueCapability.Value = TwainCapabilityValue.TransferMechanismFile; 
                            twnSession.SetCapability(twSetCapability, TwainSetCapabilityMode.Set); 
                         } 
                      } 
                   } 
                   catch (Exception ex) 
                   { 
                      MessageBox.Show(this, ex.Message);
                   } 
                }
                
    

13. Add an event handler to the buttonSetBrightness Click event and code it as follows:

    [Visual Basic]

                Private Sub buttonSetBrightness_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonSetBrightness.Click 
                   Try 
                      Dim twCapability As TwainCapability = new TwainCapability 
                      twCapability.Information.ContainerType = TwainContainerType.OneValue 
                      twCapability.Information.Type = TwainCapabilityType.ImageBrightness 
                      Dim brightneesValue As Integer = 50 
                      twCapability.OneValueCapability.ItemType = TwainItemType.Fix32 
                      twCapability.OneValueCapability.Value = brightneesValue 
                      twnSession.SetCapability(twCapability, TwainSetCapabilityMode.Set) 
                   Catch ex As Exception 
                      MessageBox.Show(ex.Message) 
                   End Try 
                End Sub
                
    

    [C#]

                private void buttonSetBrightness_Click(object sender, System.EventArgs e) 
                { 
                   try 
                   { 
                      TwainCapability twCapability = new TwainCapability(); 
                      twCapability.Information.ContainerType = TwainContainerType.OneValue; 
                      twCapability.Information.Type = TwainCapabilityType.ImageBrightness; 
                      float brightneesValue = 50; 
                      twCapability.OneValueCapability.ItemType = TwainItemType.Fix32; 
                      twCapability.OneValueCapability.Value = brightneesValue; 
                      twnSession.SetCapability(twCapability, TwainSetCapabilityMode.Set); 
                   } 
                   catch (Exception ex) 
                   { 
                      MessageBox.Show(this, ex.Message); 
                   } 
                }
                
    

14. Add an event handler to the buttonAcquire Click event and code it as follows:

    [Visual Basic]

                Private Sub buttonAcquire_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonAcquire.Click 
                   Try 
                      Dim twnPros As TwainProperties = twnSession.Properties 
                      Dim dataTransfer As TwainDataTransferProperties = twnPros.DataTransfer 
                      dataTransfer.FileName = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) & "//LEADTOOLS Images//" & "Twain.bmp" 
                      twnPros.DataTransfer = dataTransfer 
                      twnSession.Properties = twnPros 
                      twnSession.Acquire(TwainUserInterfaceFlags.Show) 
                   Catch ex As Exception 
                      MessageBox.Show(ex.Message) 
                   End Try 
                End Sub
                
    

    [C#]

                private void buttonAcquire_Click(object sender, System.EventArgs e) 
                { 
                   try 
                   { 
                      TwainProperties twnPros = twnSession.Properties; 
                      TwainDataTransferProperties dataTransfer = twnPros.DataTransfer; 
                      dataTransfer.FileName = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "//LEADTOOLS Images//" + "Twain.bmp"; 
                      twnPros.DataTransfer = dataTransfer; 
                      twnSession.Properties = twnPros; 
                      twnSession.Acquire(TwainUserInterfaceFlags.Show); 
                   } 
                   catch (Exception ex) 
                   { 
                      MessageBox.Show(ex.Message); 
                   } 
                }
                
    

15. Build, and Run the program to test it.