title: SSIS using Script task - Convert XLS to CSV
body: <p>I am using C# script task component to convert XLS to CSV file , my entry point is set to ScriptMain</p>
  
  <p>But I am constantly getting error "Error: Cannot execute script because the script entry point is invalid."</p>
  
  <pre><code>/*
     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.Collections.Generic;
  using System.Text;
  using System.Data;
  using System.IO;
  using System.Data.OleDb;
  
  namespace ST_1feb807359714c80ae0bdd964110df59.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.
      */
  
  
          static void Main(string[] args)
          {
  
              string sourceFile, worksheetName, targetFile;
  
              sourceFile = "C:\\NewFolder\\Sample.xls"; worksheetName = "sheet1"; targetFile = "C:\\NewFolder\\target.csv";
  
              convertExcelToCSV(sourceFile, worksheetName, targetFile);
  
          }
          static void convertExcelToCSV(string sourceFile, string worksheetName, string targetFile)
          {
  
              string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + sourceFile + ";Extended Properties=\" Excel.0;HDR=Yes;IMEX=1\"";
  
              OleDbConnection conn = null;
  
              StreamWriter wrtr = null;
  
              OleDbCommand cmd = null;
  
              OleDbDataAdapter da = null;
  
              try
              {
  
                  conn = new OleDbConnection(strConn);
  
                  conn.Open();
  
  
  
                  cmd = new OleDbCommand("SELECT * FROM [" + worksheetName + "$]", conn);
  
                  cmd.CommandType = CommandType.Text;
  
                  wrtr = new StreamWriter(targetFile);
  
  
  
                  da = new OleDbDataAdapter(cmd);
  
                  DataTable dt = new DataTable();
  
                  da.Fill(dt);
  
  
  
                  for (int x = 0; x &lt; dt.Rows.Count; x++)
                  {
  
                      string rowString = "";
  
                      for (int y = 0; y &lt; dt.Columns.Count; y++)
                      {
  
                          rowString += "\"" + dt.Rows[x][y].ToString() + "\",";
  
                      }
  
                      wrtr.WriteLine(rowString);
  
                  }
  
                  Console.WriteLine();
  
                  Console.WriteLine("Done! Your " + sourceFile + " has been converted into " + targetFile + ".");
  
                  Console.WriteLine();
  
              }
  
              catch (Exception exc)
              {
  
                  Console.WriteLine(exc.ToString());
  
                  Console.ReadLine();
  
              }
  
              finally
              {
  
                  if (conn.State == ConnectionState.Open)
  
                      conn.Close();
  
                  conn.Dispose();
  
                  cmd.Dispose();
  
                  da.Dispose();
  
                  wrtr.Close();
  
                  wrtr.Dispose();
  
              }
  
          }
  
      }
  }
  </code></pre>