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Returns the ITextRange object that represents the text in the object.
Use the returned text range to read or modify the shape text and its formatting.
ITextRange TextRange { get; }
ReadOnly Property TextRange As ITextRange
IShape shape = worksheet.Shapes.AddShape(AutoShapeType.Rectangle, 10, 10, 120, 60);
ITextFrame textFrame = shape.TextFrame;
ITextRange textRange = textFrame.TextRange;
textRange.Text = "Hello";