Ungroup shape in word file in c#

Hi, I have a word file which contains numbers of shapes. Each shape contain some textboxes. I am copying that file to another location and assigning some values to those textboxes of those shapes. Now I have to assign the values to those textboxes then I have to ungroup those shape first then only I can assign values those text boxes. Now the problem is that when I ungroup those shapes, they change their locations in the document. I do not understand what is the problem. Here is the code //copy the sourc file to another location System.IO.File.Copy(Convert.ToString(source), Convert.ToString(destination)); Microsoft.Office.Interop.Word.Document obDoc = new Microsoft.Office.Interop.Word.Document(); object unknown = Type.Missing; object format = Microsoft.Office.Interop.Word.WdSaveFormat.wdFormatDocumentDefault; obDoc = varWord.Documents.Add(ref source, ref unknown, ref unknown, ref visible); obDoc.Activate(); //hiding a shape--working fine obj = "shape1"; varWord.ActiveDocument.Shapes.get_Item(ref obj).Select(ref unknown); varWord.ActiveDocument.Shapes.get_Item(ref obj).Visible = MsoTriState.msoFalse; //ungroup the shape obj = "Shape2"; varWord.ActiveDocument.Shapes.get_Item(ref obj).Select(ref unknown); varWord.ActiveDocument.Shapes.get_Item(ref obj).Ungroup(); obj = "txtbox1"; varWord.ActiveDocument.Shapes.get_Item(ref obj).Select(ref unknown); varWord.Selection.TypeText(txtbox1value); //show the word file varWord.Visible = true; varWord = null; :(