使用C#读取单个excel单元格(A3)

我正在尝试使用C#读取单个excel单元格（A3），但由于下面提到的错误，此代码失败了。我正在使用SSIS脚本任务。请帮帮我！！！感谢

/*
   Microsoft SQL Server Integration Services Script Task
   Write scripts using Microsoft Visual C# 2008.
   The ScriptMain is the entry point class of the script.
*/
using System;
using System.Data;
using Microsoft.SqlServer.Dts.Runtime;
using System.Windows.Forms;
using Microsoft.Office.Interop.Excel; //use the reference in your code
namespace ST_72bc640805c54a799cae807cc596a894.csproj
{
    [System.AddIn.AddIn("ScriptMain", Version = "1.0", Publisher = "", Description = "")]
    public partial class ScriptMain : Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTARTScriptObjectModelBase
    {
        #region VSTA generated code
        enum ScriptResults
        {
            Success = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Success,
            Failure = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Failure
        };
        #endregion
        /*
        The execution engine calls this method when the task executes.
        To access the object model, use the Dts property. Connections, variables, events,
        and logging features are available as members of the Dts property as shown in the following examples.
        To reference a variable, call Dts.Variables["MyCaseSensitiveVariableName"].Value;
        To post a log entry, call Dts.Log("This is my log text", 999, null);
        To fire an event, call Dts.Events.FireInformation(99, "test", "hit the help message", "", 0, true);
        To use the connections collection use something like the following:
        ConnectionManager cm = Dts.Connections.Add("OLEDB");
        cm.ConnectionString = "Data Source=localhost;Initial Catalog=AdventureWorks;Provider=SQLNCLI10;Integrated Security=SSPI;Auto Translate=False;";
        Before returning from this method, set the value of Dts.TaskResult to indicate success or failure.
        To open Help, press F1.
    */
        public void Main()
        {
            object _row = 3;
            object _column = 1;
            Microsoft.Office.Interop.Excel.Application excelApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
            excelApp.Visible = false;
            excelApp.ScreenUpdating = false;
            excelApp.DisplayAlerts = false;
            Microsoft.Office.Interop.Excel.Workbook excelWorkbook = excelApp.Workbooks.Open(@"C:''ETL Process''Sample.xlsx", 0, false, 5, "", "", false, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "", true, false, 0, true, false, false);
             Microsoft.Office.Interop.Excel.Sheets excelSheets = excelWorkbook.Worksheets;
            string currentSheet = "Sheet1";
            Microsoft.Office.Interop.Excel.Worksheet excelWorksheet = (Microsoft.Office.Interop.Excel.Worksheet)excelSheets.get_Item(currentSheet);
            Microsoft.Office.Interop.Excel.Range range = (Microsoft.Office.Interop.Excel.Range)excelWorksheet.UsedRange;
            string sValue = (range.Cells[_row, _column] as Microsoft.Office.Interop.Excel.Range).Value2.ToString();
            MessageBox.Show(sValue); 
            //sValue has your value
        }
    }
}

这里是错误

错误：System.Reflection.TargetInvocationException：已发生异常由调用的目标抛出。--->System.IO.FileNotFoundException：未能加载文件或程序集'Microsoft.Office.Interop.Excel，版本=12.0.0.0，区域性=中性，PublicKeyToken=71e9cce111e9429c'或其依赖项之一。这个系统找不到指定的文件。文件名：'Microsoft.Office.Interop.Excel，版本=12.0.0.0，区域性=中性，PublicKeyToken=71e9cce111e9429c'ST_72bc640805c54a799cae807cc596a894.csproj.ScriptMain.Main（）

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---内部异常堆栈跟踪结束--在System.RuntimeMethodHandle_InvokeMethodFast（对象目标，对象[]自变量，SignatureStruct&sig，MethodAttributes MethodAttributes，RuntimeTypeHandle typeOwner）System.Reflection.RuntimeMethodInfo.IInvoke（Object obj，BindingFlagsinvokeAttr，Binder绑定器，Object[]参数，CultureInfo区域性，布尔skipVisibilityChecks）System.Reflection.RuntimeMethodInfo.IInvoke（Object obj，BindingFlagsinvokeAttr、Binder绑定器、Object[]参数、CultureInfo区域性）
位于System.RuntimeType.IInvokeMember（字符串名称，BindingFlagsbindingFlags，Binder Binder，Object target，Object[]providedArgs，ParameterModifier[]修饰符，CultureInfo区域性，String[]namedParams）Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTATaskScriptingEngine.ExecuteScript（）

我甚至把它添加到了系统中http://msdn.microsoft.com/en-us/library/kh3965hw%28VS.80%29.aspx