How To Merge Two Columns in Griddataboundgrid in Windows Forms GridDataBoundGrid(Classic)

You can make use of CoveredRanges property to merge two or more columns in GridDataBoundGrid.

this.gridDataBoundGrid1.Model.CoveredRanges.Add(GridRangeInfo.Cells(0,3,0,4));
Private void gridDataBoundGrid1_CellClick(object sender, GridCellClickEventArgs e)
{
    if (e.RowIndex == 0 && e.ColIndex > 0)
    {
        GridRangeInfo range;
        bool check = this.gridDataBoundGrid1.Model.CoveredRanges.Find(e.RowIndex, e.ColIndex, out range);
        if (check)
        this.gridDataBoundGrid1.Model.Selections.Add(GridRangeInfo.Cols(range.Left, range.Right));

    }
}

//On Mouse down, select both the columns to be merged.
Private void gridDataBoundGrid1_MouseDown(object sender, MouseEventArgs e)
{
    int row, col;
    this.gridDataBoundGrid1.PointToRowCol(new Point(e.X, e.Y), out row, out col);
    if (row == 0 && col > 0)
    {
        GridRangeInfo range;
        bool check = this.gridDataBoundGrid1.Model.CoveredRanges.Find(row, col, out range);
        if (check)
        this.gridDataBoundGrid1.Model.Selections.Add(GridRangeInfo.Cols(range.Left, range.Right));
    }
}
Me.gridDataBoundGrid1.Model.CoveredRanges.Add(GridRangeInfo.Cells(0,3,0,4));
Private Sub GridDataBoundGrid1_CellClick(ByVal sender As System.Object, ByVal e As Syncfusion.Windows.Forms.Grid.GridCellClickEventArgs) Handles GridDataBoundGrid1.CellClick
If e.RowIndex = 0 AndAlso e.ColIndex > 0 Then
Dim range As GridRangeInfo
Dim check As Boolean = Me.gridDataBoundGrid1.Model.CoveredRanges.Find(e.RowIndex, e.ColIndex, range)
If check Then
Me.gridDataBoundGrid1.Model.Selections.Add(GridRangeInfo.Cols(range.Left, range.Right))
End If
End If

'On Mouse down, select both the columns to be merged.
Private Sub GridDataBoundGrid1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles GridDataBoundGrid1.MouseDown
Dim row, col As Integer
Me.gridDataBoundGrid1.PointToRowCol(New Point(e.X, e.Y), row, col)
If row = 0 AndAlso col > 0 Then
Dim range As GridRangeInfo
Dim check As Boolean = Me.gridDataBoundGrid1.Model.CoveredRanges.Find(row, col, range)
If check Then
Me.gridDataBoundGrid1.Model.Selections.Add(GridRangeInfo.Cols(range.Left, range.Right))
End If
End If