windows form 窗体的GDI+使用，根据数据库内容生成折线，树状，扇形图

windows form 窗体的GDI+使用， 根据数据库内容生成折线，树状，扇形图.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;

namespace WindowsFormsApplication1
{
	class DataAccesss
	{
		private string str_con = “server=.;database=student;uid=sa;pwd=123456;“;
		SqlConnection con;
		SqlCommand cmd;
		SqlDataAdapter da;
		DataSet[] DsArr = new DataSet[10] { new DataSet（）new DataSet（）new DataSet（）new DataSet（）new DataSet（）new DataSet（）new DataSet（）new DataSet（）new DataSet（）new DataSet（）};
		public DataTable Show（string sqlint count） 
		{
			DataTable dt = new DataTable（）;
			try
			{
				if （sql == null） return dt;
				con = new SqlConnection（str_con）;
				da = new SqlDataAdapter（sql con）;
				da.Fill（DsArr[count]）;
				dt = DsArr[count].Tables[0];
			}
			catch （Exception）{}
			return dt;
		}

		public bool ExecuteNonQuery（string sql） 
		{
			con = new SqlConnection（str_con）;
			con.Open（）;
			cmd = new SqlCommand（sql con）;
			if （cmd.ExecuteNonQuery（） != 0）
			{
				con.Close（）;
				return true;
			}
			else
			{
				con.Close（）;
				return false;
			}
		}
	}
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2017-03-18 13:12  GDI+\
     目录           0  2017-03-18 13:12  GDI+\WindowsFormsApplication1\
     目录           0  2017-03-18 13:12  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\
     文件        1150  2017-03-18 14:38  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\DataAccesss.cs
     文件        6167  2017-03-21 13:00  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\Form1.Designer.cs
     文件       12180  2017-03-21 13:01  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs
     文件        5817  2017-03-21 13:00  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\Form1.resx
     文件        2728  2017-03-21 12:42  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\Form2.cs
     文件        2869  2017-03-21 12:42  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\Form2.designer.cs
     文件        5817  2017-03-21 12:42  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\Form2.resx
     文件         439  2017-03-21 13:01  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\Program.cs
     目录           0  2017-03-18 13:12  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\Properties\
     文件        1398  2017-03-18 13:12  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\Properties\AssemblyInfo.cs
     文件        2551  2017-03-18 13:12  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\Properties\Resources.Designer.cs
     文件        5612  2017-03-18 13:12  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\Properties\Resources.resx
     文件        1032  2017-03-18 13:12  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\Properties\Settings.Designer.cs
     文件         249  2017-03-18 13:12  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\Properties\Settings.settings
     文件        4053  2017-03-21 12:41  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\WindowsFormsApplication1.csproj
     目录           0  2017-03-18 13:12  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\bin\
     目录           0  2017-03-18 13:12  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\
     文件       21504  2017-03-21 13:02  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe
     文件       38400  2017-03-21 13:02  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.pdb
     文件       11600  2017-03-21 13:02  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe
     文件         490  2010-03-17 22:39  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe.manifest
     目录           0  2017-03-18 13:12  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\obj\
     目录           0  2017-03-18 13:12  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\
     目录           0  2017-03-18 13:12  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\
     文件        7473  2017-03-20 21:12  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        6329  2017-03-21 13:02  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件         548  2017-03-21 13:02  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\GenerateResource.read.1.tlog
     文件        1302  2017-03-21 13:02  GDI+\WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\GenerateResource.write.1.tlog
............此处省略12个文件信息