c# - MSChart : How to add custom label in bar chart -

i want add custom label ( category 1 , category 2 ) not getting idea whether need add new series or using custom label function.. appreciated.

here data table,

    datatable dt = new datatable();      datacolumn dc;      dc = new datacolumn();     dc.columnname = "question";     dt.columns.add(dc);      dc = new datacolumn();     dc.columnname = "section";     dt.columns.add(dc);      dc = new datacolumn();     dc.columnname = "user1";     dt.columns.add(dc);      dc = new datacolumn();     dc.columnname = "user2";     dt.columns.add(dc);       datarow dr;     dr = dt.newrow();      dr["question"] = "a";     dr["section"] = "category 1";     dr["user1"] = "1";     dr["user2"] = "2";      dt.rows.add(dr);      dr = dt.newrow();      dr["question"] = "b";     dr["section"] = "category 1";     dr["user1"] = "4";     dr["user2"] = "5";       dt.rows.add(dr);      dr = dt.newrow();      dr["question"] = "c";     dr["section"] = "category 1";     dr["user1"] = "2";     dr["user2"] = "5";      dt.rows.add(dr);      dr = dt.newrow();      dr["question"] = "x";     dr["section"] = "category 2";     dr["user1"] = "3";     dr["user2"] = "5";      dt.rows.add(dr);      dr = dt.newrow();      dr["question"] = "y";     dr["section"] = "category 2";     dr["user1"] = "5";     dr["user2"] = "1";      dt.rows.add(dr);      dr = dt.newrow();      dr["question"] = "z";     dr["section"] = "category 2";     dr["user1"] = "6";     dr["user2"] = "5";       dt.rows.add(dr); 

my chart plotting code,

    series series = new series("series1");     chart4.series.add("series1");     chart4.series.add("series2");      chart4.chartareas.add("chartarea1");      // set series chart type     chart4.series["series1"].charttype = seriescharttype.bar;     chart4.series["series2"].charttype = seriescharttype.bar;      // draw 3d cylinder     chart4.series["series1"]["drawingstyle"] = "cylinder";     chart4.series["series2"]["drawingstyle"] = "cylinder";      chart4.datasource = dt.defaultview;      chart4.chartareas["chartarea1"].axisx.interval = 1;      chart4.series["series1"].xvaluemember = "question";     chart4.series["series1"].yvaluemembers = "user1";     chart4.series["series2"].yvaluemembers = "user2";      chart4.databind(); 

solution

            datatable dt = new datatable();              datacolumn dc;              dt.columns.add("id", typeof(int));              dc = new datacolumn();             dc.columnname = "question";             dt.columns.add(dc);              dc = new datacolumn();             dc.columnname = "section";             dt.columns.add(dc);              dc = new datacolumn();             dc.columnname = "user1";             dt.columns.add(dc);              datarow dr;              dr = dt.newrow();              dr["question"] = "aa";             dr["id"] = 1;             dr["section"] = "category1";             dr["user1"] = "6";              dt.rows.add(dr);              dr = dt.newrow();              dr["question"] = "bb";             dr["id"] = 2;             dr["section"] = "category1";             dr["user1"] = "1";              dt.rows.add(dr);               dr = dt.newrow();              dr["question"] = "xx";             dr["id"] = 3;             dr["section"] = "category2";             dr["user1"] = "3";              dt.rows.add(dr);              dr = dt.newrow();              dr["question"] = "yy";             dr["id"] = 4;             dr["section"] = "category2";             dr["user1"] = "4";              dt.rows.add(dr);              dr = dt.newrow();              dr["question"] = "zz";             dr["id"] = 5;             dr["section"] = "category2";             dr["user1"] = "2";              dt.rows.add(dr);              series series = new series("series1");             chart4.series.add("series1");              chart4.chartareas.add("chartarea1");              chart4.series["series1"].charttype = seriescharttype.bar;              chart4.series["series1"]["barlabelstyle"] = "center";              chart4.series["series1"]["drawingstyle"] = "cylinder";              chart4.series["series1"].xvaluemember = "question";              chart4.series["series1"].yvaluemembers = "user1";              chart4.datasource = dt;             chart4.databind();              foreach (var g in dt.asenumerable().groupby(x => x.field<string>("section")))             {                 string section = g.key;                 var questions = g.select(r => new { id = r.field<int>("id"), question = r.field<string>("question") });                 int min = questions.min(y => y.id);                 int max = questions.max(y => y.id);                  var sectionlabel=new customlabel();                 if (min == max)                 {                     sectionlabel = new customlabel(min - 0.5, max + 0.5, section, 1, labelmarkstyle.linesidemark);                 }                 else                 {                      sectionlabel = new customlabel(min, max, section, 1, labelmarkstyle.linesidemark);                 }                 chart4.chartareas[0].axisx.customlabels.add(sectionlabel);              }              chart4.chartareas["chartarea1"].axisx.interval = 1; 

the easiest way add annotations chart

textannotation text = new textannotation(); text.text = 'category 1'; text.x = 20; text.y = 20; chart4.annotations.add(text); 

you can draw line using lineannotation

http://msdn.microsoft.com/en-us/library/dd456725.aspx