How to Apply the Row Mouse Hover Effect in WinForms DataGrid?

This example illustrates how to apply the row mouse hover effect in WinForms DataGrid (SfDataGrid).

By default, DataGrid does not provide the direct support for change the background color when mouse hover. You can change the background color by using SfDataGrid.QueryCellStyle event.

sfDataGrid1.TableControl.MouseMove += TableControl_MouseMove; 
sfDataGrid1.QueryCellStyle += sfDataGrid1_QueryCellStyle; 
sfDataGrid1.TableControl.MouseLeave += TableControl_MouseLeave; 
 
int hoveredRowIndex = -1;

void TableControl_MouseLeave(object sender, EventArgs e)
{
    //To remove the hovered row color while the mouse is leaves the SfDataGrid.
    sfDataGrid1.TableControl.Invalidate(sfDataGrid1.TableControl.GetRowRectangle(hoveredRowIndex, true));
    hoveredRowIndex = -1;
}

void sfDataGrid1_QueryCellStyle(object sender, Syncfusion.WinForms.DataGrid.Events.QueryCellStyleEventArgs e)
{
     if (e.RowIndex == hoveredRowIndex)
     {
          //Set the back color for the hovered row cells. 
          e.Style.BackColor = Color.Yellow;
     }
}

void TableControl_MouseMove(object sender, MouseEventArgs e)
{
     var rowColumnIndex = this.sfDataGrid1.TableControl.PointToCellRowColumnIndex(this.sfDataGrid1.TableControl.PointToClient(Cursor.Position));

     // Update the hovered row index. 
     if (hoveredRowIndex != rowColumnIndex.RowIndex)
     {         
         sfDataGrid1.TableControl.Invalidate(sfDataGrid1.TableControl.GetRowRectangle(hoveredRowIndex, true));
         hoveredRowIndex = rowColumnIndex.RowIndex;
         sfDataGrid1.TableControl.Invalidate(sfDataGrid1.TableControl.GetRowRectangle(hoveredRowIndex, true));
     }
}