Follow the below steps to create a Windows Forms application in .NET Framework platform:

1. Click on 'Create a new project' and select 'Windows Forms App (.NET Framework)'.
   
2. Name the project and click Create.
   
3. Right click on References and click 'Manage NuGet Packages'.
   
   
4. Search 'Grapecity.Spread' and install GrapeCity.Spread.WinForms NuGet package in your solution.
   
   
5. Right click Properties and add a new item.
   
   
6. Add a text file from 'Add new item' dialog and name it as licenses.licx.
   
   
7. Add Spread's license string as follows:
   

   FarPoint.Win.Spread.FpSpread, FarPoint.Win.Spread
   

   
   
8. Double click on Form1.cs and add the fpSpread control using the following code in its form load event.
   

   Form1.cs	Copy Code
   FpSpread fpSpread1 = new FpSpread(); fpSpread1.Location = new System.Drawing.Point(52, 12); fpSpread1.Name = "fpSpread1"; fpSpread1.Size = new System.Drawing.Size(653, 380); fpSpread1.Sheets.Count = 2; this.Controls.Add(fpSpread1); fpSpread1.ActiveSheet.Cells[0, 0].Text = "Welcome";

   
   
9. Build the project and run to view fpSpread control on to the Form.

Please note that the WinForms .NET 5/.NET 6 Edition does not provide complete design-time support. Hence, you might not be able to drag drop spread control from toolbox.

The below steps use Visual Studio 2019 v16.9+ to create a Windows Forms application as it supports .NET 5/.NET 6/.NET Core 3.1 platforms:

1. Click on 'Create a new project' and select 'Windows Forms App (.NET)'.
   
2. Name the project and click Create.
   
   
3. Right click on References and click 'Manage NuGet Packages'.
   
   
4. Search 'Grapecity.Spread' and install GrapeCity.Spread.WinForms NuGet package in your solution.
   
5. Double click on Form1.cs and add the fpSpread control using the following code in its form load event.
   

   Form1.cs	Copy Code
   FpSpread fpSpread1 = new FpSpread(); fpSpread1.Location = new System.Drawing.Point(52, 12); fpSpread1.Name = "fpSpread1"; fpSpread1.Size = new System.Drawing.Size(653, 380); fpSpread1.Sheets.Count = 2; this.Controls.Add(fpSpread1); fpSpread1.ActiveSheet.Cells[0, 0].Text = "Welcome";

   
   
6. Build the project and run to view fpSpread control on to the Form.