how to chart line width increase and color changes using mvc chart?

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C#3.5

am create a new chart code for

string greenTheme = @"<Chart BackColor=""#C9DC87"" BackGradientStyle=""TopBottom"" BorderColor=""181, 64, 1"" BorderWidth=""1"" BorderlineDashStyle=""Solid"" Palette=""BrightPastel"" PaletteCustomColors='0,0,255; 0,255,0; 255,0,0; 0,255,255; 255,0,255; 255,255,0' >
                   <ChartAreas>
                   <ChartArea Name=""Default"" _Template_=""All"" BackColor=""Transparent"" BackSecondaryColor=""White"" BorderColor=""64, 64, 64, 64"" BorderDashStyle=""Solid"" ShadowColor=""Transparent"">
                     <AxisY LineColor=""64, 64, 64, 64"">
                       <MajorGrid Interval=""Auto"" LineColor=""64, 64, 64, 64"" />
                       <LabelStyle Font=""Trebuchet MS, 8.25pt, style=Bold"" />
                     </AxisY>
                     <AxisX LineColor=""64, 64, 64, 64"" Interval=""1"">
                       <MajorGrid LineColor=""64, 64, 64, 64"" />
                       <LabelStyle Font=""Trebuchet MS, 8.25pt, style=Bold"" />
                     </AxisX>
                     <Area3DStyle Inclination=""15"" IsClustered=""False"" IsRightAngleAxes=""False"" Perspective=""10"" Rotation=""10"" WallWidth=""0"" />

                   </ChartArea>
                 </ChartAreas>
                 <Legends>
                   <Legend _Template_=""All"" Alignment=""Center""  BackColor=""Transparent""  Docking=""Bottom"" Font=""Trebuchet MS, 10pt, style=Bold"" IsTextAutoFit =""False"" LegendStyle=""Row"">

                   </Legend>
                 </Legends>
                 <BorderSkin SkinStyle=""Emboss"" />
               </Chart>";

var myChart = new Chart(width: 900, height: 400, theme: greenTheme)
                   .AddSeries(Class,
                     xValue: xFieldRange,
                     yValues: 90,80,null,56
                   chartType: type, markerStep: 500)

                   .AddSeries(AVG,
                       xValue: xFieldRange,
                       yValues: null,0,null,23,
                       chartType: type, markerStep: 500)

                   .AddSeries(MARK,
                         xValue: xFieldRange,
                       yValues: null,100,null,23,
                       chartType: type, markerStep: 500)

                     .AddSeries(GOAL,
                         xValue: xFieldRange,
                       yValues: null,10,null,29,
                       chartType: type, markerStep: 500,chartArea :null).AddLegend()
                   .Save(fileName,FILE_FORMAT);

this code use but not show point line and labels
please help me
chart line width increase and point value near label show and null value point color change