public Image BytesToImage(Byte[] buffer)

    {

      var ms = new MemoryStream(buffer, 0, buffer.Length);

      return Image.FromStream(ms);

    }

    private void Text26_BeforePrint(object sender, EventArgs e)

    {

      DataSourceBase ds = Report.GetDataSource("subDataTable");

      ds.Init();

      while (ds.HasMoreRows)

      {

        // get the data column value from the current row

        string imgName = (string)Report.GetColumnValue("subDataTable.IMGNAME");

        if(imgName=="img2")

        {

           Picture2.Image=  BytesToImage(Convert.FromBase64String(Report.GetColumnValue("subDataTable.检测图片").ToString())) ;

        }

        // do something with it...

        s+=imgName+",";

        // go next data row

        ds.Next();

      }

    }