Custom WinForms control based on PictureBox for creating versatile tables.
It's fast, uses almost no memory, doesn't have any dependencies, and not limited by limitations of WinForms since it draws itself from scrach.

Get it from NuGet:

• Cell Drag & Drop
• Subheaders
• Cell Copy & Paste (using Ctrl + drag)
• Headers can span multiple rows (or columns)
• Cells can span multiple rows
• Cells can overlap each other (they will be merged or replaced placeholder)
• Cell styling (font, backound color, margin, text aligment)
• Table styling (font, background color, border color)
• Printing support (you can print the table or draw it using your Graphics instance)
• Cells can be disabled (user cannot interact with them)
• ToolTip for cells
• Supported events:
  • CellWithValueClick, CellOverlapPlaceholderClick
  • CellCreating, CellCreated
  • CellCopied, CellPasted
  • CellDragOver, CellDragDropFinished
  • CellsMerging

Before using the control you need to initialize it by providing list of row and column configurations:

drawnTable.Table.Create(Rows, Cols);

There is HeaderCreator class that can help you create those configurations. For example here's how to generate headers for a range of dates, and then get header index for some date:

HeaderCreator headers = new();
var columns = headers.Day.GenerateHeaders(dayStart, dayEnd, colFilter, "dd.MM, dddd");
...
int columnIndex = headers.Day.GetIndexByValue(date);

See demo appication for more usage samples.