C#NET2008 problem with Microsoft WORD 2003

 Word.InlineShape objShape;

 object objclassType = "MSGraph.Chart.8";

 objTblRange = objDoc.Bookmarks.get_Item(ref objEndOfDoc).Range;

 objShape = objTblRange.InlineShapes.AddOLEObject(ref objclassType, ref  objMissing,refobjMissing, ref objMissing, ref objMissing,           

 ref objMissing, ref objMissing, ref objMissing, ref objMissing );

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Error 3    The name 'BindingFlags' does not exist in the current context   

 //demonstrate use of Late bound chart and oChartAoo objects to

 //manipulate the chart object with MSGraph.

 object objChart;

 object objChartApp;

 objChart = objShape.OLEFormat.Object;

 objChartApp = objChart.GetType().InvokeMember("Application", BindingFlags.GetProperty,null, objChart, null);                                                                            

  //change the chart type to Line.

  object[] Parameters = new object[1];

  Parameters[0] = 4;      //xlLine = 4

  objChart.GetType().InvokeMember("ChartType",  BindFlags.SetsProperty, null, objChart, Parameters);

  //update the chart image and quit MSGraph.

  objChartApp.GetType().InvokeMember("Update", BindingFlags.InvokeMethod, null, objChartApp, null);

  objChartApp.GetType().InvokeMember("Quit", BindingFlags.InvokeMethod, null, objChartApp, null);