关于VS2010中asp.net后台代码中一个报错，不知道什么意思

报的错是这个：

然后我的后台代码是如下，起初没有任何错误提示，但是按下F11调试后就出现上面的错误了

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Web.UI.DataVisualization.Charting;

namespace zhu
{
public partial class WebForm1 : System.Web.UI.Page
{
private SqlConnection SqlConnString;

    string[] Count1 = new string[9];
    double[] Count2 = new double[9];
    //string[] Count3 = new string[11];
    protected void Page_Load(object sender, EventArgs e)
    {

        DataSet ds = new DataSet();
        string vOutParam = "";

        ds = ExeProcDT3("Searchtable5", "", ref vOutParam);
        if (ds.Tables.Count >0)
        {
            DataTable dt = new DataTable();
            dt = ds.Tables[0];
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < 9; i++)
                {

                    Count2[i] = Convert.ToDouble(dt.Rows[i]["AM"]);
                    Count1[i] = dt.Rows[i]["c"].ToString() + dt.Rows[i]["a"].ToString();

                }
            }
        }
        zhuzhaugntu(Count1, Count2);



    }

    //柱状图图形的设置
    private void zhuzhaugntu(string[] a, double[] b)
    {
        Chart1.ChartAreas[0].BackColor = Color.Black;//设置背景为黑色
        Chart1.ChartAreas[0].Area3DStyle.PointGapDepth = 10;//x轴行间距
        Chart1.ChartAreas[0].AxisY.MajorGrid.LineDashStyle = ChartDashStyle.Dash;//需线
        Chart1.ChartAreas[0].AxisY.MajorGrid.LineColor = Color.Yellow;//需线颜色
        Chart1.ChartAreas[0].AxisX.MajorGrid.Enabled = false;//关掉竖线1
        //根据水尺最高值设置Y轴间距

        Chart1.ChartAreas[0].AxisY.Maximum = 5000;
        Chart1.Series[0].Label = "#VAL";//设置标签文本 (在设计期通过属性窗口编辑更直观)
        Chart1.Series[0].IsValueShownAsLabel = true;//显示标签
        Chart1.ChartAreas[0].AxisX.LabelStyle.ForeColor = Color.Blue;
        Chart1.ChartAreas[0].AxisX.LabelAutoFitMaxFontSize = 12;
        Chart1.ChartAreas[0].AxisY.LabelAutoFitMaxFontSize = 15;
        Chart1.ChartAreas[0].AxisY.LabelStyle.ForeColor = Color.Red;

        Chart1.Series[0].Points.DataBindXY(a, b);//初始化数据


        /*Chart1.Series[1].Label = "#VAL";
        Chart1.Series[1].IsValueShownAsLabel = true;
        Chart1.ChartAreas[0].AxisX2.LabelStyle.ForeColor = Color.Blue;
        Chart1.ChartAreas[0].AxisX2.LabelAutoFitMaxFontSize = 12;
        Chart1.Series[0].Points.DataBindXY(c);*/
    }
    //连接数据库
    private SqlConnection GetConnect()
    {
        string strSqlSqlConn = "Data Source=.;Initial Catalog=plc;" +
            "Persist Security Info=True;User ID=Jerome;Password=123456";
        SqlConnection sqlConnString = new SqlConnection(strSqlSqlConn);
        return sqlConnString;
    }
    /// <summary>
    /// 执行单入存过带多个表
    /// </summary>
    /// <param name="procName">存储过程名称</param>
    /// <param name="vInParam">输入参数</param>
    /// <param name="vOutParam">输出参数</param>
    /// <returns></returns>
    public DataSet ExeProcDT3(string procName, string vInParam, ref string vOutParam)
    {
        try
        {
            SqlConnString = GetConnect();
            SqlCommand SqlCmd = new SqlCommand(procName, SqlConnString);
            SqlCmd.CommandType = CommandType.StoredProcedure;
            SqlCmd.Parameters.Add("@inparam", SqlDbType.VarChar, 1000).Value = vInParam;
            SqlCmd.Parameters.Add("@outparam", SqlDbType.VarChar, 1024).Direction = ParameterDirection.Output;
            SqlDataAdapter SqlDa = new SqlDataAdapter(SqlCmd);

            DataSet DS = new DataSet();
            SqlDa.Fill(DS);
            vOutParam = SqlCmd.Parameters["@outparam"].Value.ToString();
            return DS;
        }
        catch (Exception)
        {
            return null;
        }
        finally
        {
            SqlConnString.Close();
        }
    }
}

}

首先if (ds.Tables.Count >0)报未将对象引用......说明你ds根本没有获取到，和楼上说的一样判断改为if（ds.Tables != null &&ds.Tables.Count >0)
还有就是我并没有看到你有Open数据库。

SqlConnection sqlConnString = new SqlConnection(strSqlSqlConn);
sqlConnString.Open();

本人在线等 很急~！！！！！

有可能是数据库没有正确关闭导致的，调试过程中开启后，直接关闭了调试
下次运行时ExeProcDT3返回null，然后直接引用会出错
1.全部关闭，clean后重新编译运行
2.if (ds.Tables.Count >0)
改为
if（ds!=null && ds.Tables != null &ds.Tables.Count >0)试一下，这样可能会有用

ExeProcDT3函数返回空啊，要进这个函数里去调试，查找返回空的具体原因。

 执行到catch (Exception)
        {
            return null;
        }这块了

                去掉try..catch看具体报什么错误

dataset是个空对象，检查在if之前，dataset中是否存在table

去掉try..catch，然后一步步检查。

改这样，看具体错误是什么，肯定是有问题了存储过程

 public DataSet ExeProcDT3(string procName, string vInParam, ref string vOutParam)
    {
            SqlConnString = GetConnect();
            SqlCommand SqlCmd = new SqlCommand(procName, SqlConnString);
            SqlCmd.CommandType = CommandType.StoredProcedure;
            SqlCmd.Parameters.Add("@inparam", SqlDbType.VarChar, 1000).Value = vInParam;
            SqlCmd.Parameters.Add("@outparam", SqlDbType.VarChar, 1024).Direction = ParameterDirection.Output;
            SqlDataAdapter SqlDa = new SqlDataAdapter(SqlCmd);

            DataSet DS = new DataSet();
            SqlDa.Fill(DS);
            vOutParam = SqlCmd.Parameters["@outparam"].Value.ToString();
            return DS;
    }

目前代码是这样，没有报错，但按下F11调试时候，在SqlConnString .Close()也提示同样的异常信息，提示用户代码未处理NullReferenceException

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Web.UI.DataVisualization.Charting;

namespace zhu
{
public partial class WebForm1 : System.Web.UI.Page
{
private SqlConnection SqlConnString;

    string[] Count1 = new string[9];
    double[] Count2 = new double[9];
    //string[] Count3 = new string[11];
    protected void Page_Load(object sender, EventArgs e)
    {

        DataSet ds = new DataSet();
        string vOutParam = "";

        ds = ExeProcDT3("Searchtable5", "", ref vOutParam);
        if (ds.Tables.Count >0)
        {
            DataTable dt = new DataTable();
            dt = ds.Tables[0];
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < 9; i++)
                {

                    Count2[i] = Convert.ToDouble(dt.Rows[i]["AM"]);
                    Count1[i] = dt.Rows[i]["c"].ToString() + dt.Rows[i]["a"].ToString();

                }
            }
        }
        zhuzhaugntu(Count1, Count2);



    }

    //柱状图图形的设置
    private void zhuzhaugntu(string[] a, double[] b)
    {
        Chart1.ChartAreas[0].BackColor = Color.Black;//设置背景为黑色
        Chart1.ChartAreas[0].Area3DStyle.PointGapDepth = 10;//x轴行间距
        Chart1.ChartAreas[0].AxisY.MajorGrid.LineDashStyle = ChartDashStyle.Dash;//需线
        Chart1.ChartAreas[0].AxisY.MajorGrid.LineColor = Color.Yellow;//需线颜色
        Chart1.ChartAreas[0].AxisX.MajorGrid.Enabled = false;//关掉竖线1
        //根据水尺最高值设置Y轴间距

        Chart1.ChartAreas[0].AxisY.Maximum = 5000;
        Chart1.Series[0].Label = "#VAL";//设置标签文本 (在设计期通过属性窗口编辑更直观)
        Chart1.Series[0].IsValueShownAsLabel = true;//显示标签
        Chart1.ChartAreas[0].AxisX.LabelStyle.ForeColor = Color.Blue;
        Chart1.ChartAreas[0].AxisX.LabelAutoFitMaxFontSize = 12;
        Chart1.ChartAreas[0].AxisY.LabelAutoFitMaxFontSize = 15;
        Chart1.ChartAreas[0].AxisY.LabelStyle.ForeColor = Color.Red;

        Chart1.Series[0].Points.DataBindXY(a, b);//初始化数据


        /*Chart1.Series[1].Label = "#VAL";
        Chart1.Series[1].IsValueShownAsLabel = true;
        Chart1.ChartAreas[0].AxisX2.LabelStyle.ForeColor = Color.Blue;
        Chart1.ChartAreas[0].AxisX2.LabelAutoFitMaxFontSize = 12;
        Chart1.Series[0].Points.DataBindXY(c);*/
    }
    //连接数据库
    private SqlConnection GetConnect()
    {
        string strSqlSqlConn = "Data Source=.;Initial Catalog=plc;" +
            "Persist Security Info=True;User ID=Jerome;Password=123456";
        SqlConnection sqlConnString = new SqlConnection(strSqlSqlConn);
    SqlConnString.Close();
    SqlConnString.Open();
        return sqlConnString;
    }
    /// <summary>
    /// 执行单入存过带多个表
    /// </summary>
    /// <param name="procName">存储过程名称</param>
    /// <param name="vInParam">输入参数</param>
    /// <param name="vOutParam">输出参数</param>
    /// <returns></returns>
    public DataSet ExeProcDT3(string procName, string vInParam, ref string vOutParam)
    {

            SqlConnString = GetConnect();
            SqlCommand SqlCmd = new SqlCommand(procName, SqlConnString);
            SqlCmd.CommandType = CommandType.StoredProcedure;
            SqlCmd.Parameters.Add("@inparam", SqlDbType.VarChar, 1000).Value = vInParam;
            SqlCmd.Parameters.Add("@outparam", SqlDbType.VarChar, 1024).Direction = ParameterDirection.Output;
            SqlDataAdapter SqlDa = new SqlDataAdapter(SqlCmd);

            DataSet DS = new DataSet();
            SqlDa.Fill(DS);
            vOutParam = SqlCmd.Parameters["@outparam"].Value.ToString();
            return DS;
    }
}

}

问题已解决了 谢谢大家的帮忙 非常感谢~！！