w'not upload any excel(xls) files

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ASP.NET

i have one web application and launched on localhost not any server
but i am tried upload any excel on my application then error occured..

The Microsoft Jet database engine cannot open the file 'D:\bombay'. It is already opened exclusively by another user, or you need permission to view its data.

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i have use this code on upload button click event

protected void Button_upload_Click(object sender, EventArgs e)
    {
        string str = Server.MapPath("files1/" + FileUpload1.FileName);
        //string str = Server.MapPath("files/" + FileUpload1.FileName);
        FileUpload1.SaveAs(str);
        StringBuilder Connection123 = new StringBuilder();
        Connection123.Append(@"Provider=Microsoft.Jet.OLEDB.4.0;Mode=ReadWrite|Share Deny None;Data Source=");
        Connection123.Append(str);
        Connection123.Append(";Extended Properties='Excel 8.0;HDR=YES;'");
        //string constr = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Server.MapPath(FileUpload1.FileName) + ";" + "Extended Properties=Excel 8.0;";

        //Create Connection to Excel Workbook
        OleDbConnection connection = new OleDbConnection(Connection123.ToString());
        OleDbCommand command = new OleDbCommand("Select * FROM  [IP_Phone$]", connection);
        connection.Open();

        // Create DbDataReader to Data Worksheet

        OleDbDataReader dr = command.ExecuteReader();
        // SQL Server Connection String
        string sqlConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
        
        SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConnectionString);
        bulkCopy.DestinationTableName = "dbo.finish";
        bulkCopy.WriteToServer(dr);
        connection.Close();
    }