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Gets or sets the distance, in points, between the left edge of the text frame and the left edge of the inscribed rectangle of the shape that contains the text.
Use this property to determine the inner left margin applied to text within a shape's text frame.
float MarginLeft { get; set; }
Property MarginLeft As Single
IShape shape = worksheet.Shapes.AddShape(AutoShapeType.Rectangle, 10, 10, 120, 60);
ITextFrame textFrame = shape.TextFrame;
textFrame.MarginLeft = 6.0f;
float marginLeft = textFrame.MarginLeft;