I m using telerik radchart control in my window programm. below the code for populate chart. when i m using arrary then it give error , but if i simply declare chartseries then it working.
if i m using chartseries array which is show in rad color , then it gives error, and if i using green code then it working properly both code are shame only array difference.
error occuring on a[0].AddItem(Convert.ToInt32(ds.Tables["Marks"].Rows[0][0]));
error is: - nullreferenceexception was unhandled ,Object reference not set to an instance of an object.
SqlCommand cmd1 = new SqlCommand("select Paper1,Paper2,Paper3,Paper4,Paper5 from Student_Exams_Marks_Detail where S_ID='" + comboBox3.Text + "'and Section='" + comboBox2.Text + "' and Class='" + comboBox1.Text + "' ", con);
SqlDataAdapter da = new SqlDataAdapter(cmd1);
SqlDataAdapter da1 = new SqlDataAdapter(cmd3);
da.Fill(ds, "Marks");
da1.Fill(ds, "SubjectNames");
radChart1.PlotArea.XAxis.AxisLabel.TextBlock.Text = "Years";
//radChart1.DataSource = ds.Tables["v"];
radChart3.DataSource = ds.Tables["Marks"];
radChart4.DataSource = ds.Tables["Marks"];
//radChart1.Skin = "LightBlue";
radChart3.DataBind();
radChart4.DataBind();
//ChartSeries[] a;
//a = new ChartSeries[5];
//a[0].AddItem(Convert.ToInt32(ds.Tables["Marks"].Rows[0][0]));
//a[1].AddItem(Convert.ToInt32(ds.Tables["Marks"].Rows[0][1]));
//a[2].AddItem(Convert.ToInt32(ds.Tables["Marks"].Rows[0][2]));
//a[3].AddItem(Convert.ToInt32(ds.Tables["Marks"].Rows[0][3]));
//a[4].AddItem(Convert.ToInt32(ds.Tables["Marks"].Rows[0][4]));
//a[0].Name = Convert.ToString(ds.Tables["SubjectNames"].Rows[0][3]);
//a[1].Name = Convert.ToString(ds.Tables["SubjectNames"].Rows[0][4]);
//a[2].Name = Convert.ToString(ds.Tables["SubjectNames"].Rows[0][5]);
//a[3].Name = Convert.ToString(ds.Tables["SubjectNames"].Rows[0][6]);
//a[4].Name = Convert.ToString(ds.Tables["SubjectNames"].Rows[0][7]);
//radChart1.Clear();
//radChart1.Series.Add(a[0]);
//radChart1.Series.Add(a[1]);
//radChart1.Series.Add(a[2]);
//radChart1.Series.Add(a[3]);
//radChart1.Series.Add(a[4]);
ChartSeries s1 = new ChartSeries();
ChartSeries s2 = new ChartSeries();
ChartSeries s3 = new ChartSeries();
ChartSeries s4 = new ChartSeries();
ChartSeries s5 = new ChartSeries();
s1.AddItem(Convert.ToInt32(ds.Tables["Marks"].Rows[0][0]));
s2.AddItem(Convert.ToInt32(ds.Tables["Marks"].Rows[0][1]));
s3.AddItem(Convert.ToInt32(ds.Tables["Marks"].Rows[0][2]));
s4.AddItem(Convert.ToInt32(ds.Tables["Marks"].Rows[0][3]));
s5.AddItem(Convert.ToInt32(ds.Tables["Marks"].Rows[0][4]));
s1.Name = Convert.ToString(ds.Tables["SubjectNames"].Rows[0][3]);
s2.Name = Convert.ToString(ds.Tables["SubjectNames"].Rows[0][4]);
s3.Name = Convert.ToString(ds.Tables["SubjectNames"].Rows[0][5]);
s4.Name = Convert.ToString(ds.Tables["SubjectNames"].Rows[0][6]);
s5.Name = Convert.ToString(ds.Tables["SubjectNames"].Rows[0][7]);
radChart1.Clear();
radChart1.Series.Add(s1);
radChart1.Series.Add(s2);
radChart1.Series.Add(s3);
radChart1.Series.Add(s4);
radChart1.Series.Add(s5);
radChart1.PlotArea.XAxis.AxisLabel.TextBlock.Text = "vk";
radChart1.DataBind();
please help me what is wrong in it.