字符串输入格式不正确

Question

我的下面的代码显示错误“输入字符串格式不正确”

Microsoft.Practices.EnterpriseLibrary.Data.Database Obj = Microsoft.Practices.EnterpriseLibrary.Data.DatabaseFactory.CreateDatabase("InvoiceConString");
    //Create your DbCommand
    DbCommand com =Obj.GetStoredProcCommand("StoredProcedure2", InvoiceComments, Convert.ToDateTime(InvoiceDate), ProductName, Description, Convert.ToInt32(Qty), Convert.ToInt32(Amount), Convert.ToInt32(TaxAmount), Convert.ToInt32(paidAmount), CustomerName, CustomerAddress, Convert.ToInt32(UnitCost), Convert.ToInt32(InvoiceReference));
    //Execute
   int rows =com.ExecuteNonQuery();
   con.Close();
    return "data Updated Successfully";

和我的连接字符串如下

static string conStr = ConfigurationManager.ConnectionStrings["InvoiceConString"].ConnectionString;

但是当我不使用Microsoft.Practices.EnterpriseLibrary.Data.Database并更新记录时，它不会显示任何错误并且记录很容易获得更新。

注意： - 我在转换任何变量时没有任何错误，因为通过相同的变量我正在更新记录如果我使用如下更新它们

  SqlCommand com = new SqlCommand("StoredProcedure2", con);
    com.CommandType = CommandType.StoredProcedure;
    com.Parameters.Add("@InvoiceComments", SqlDbType.VarChar, 150).Value = InvoiceComments;
    com.Parameters.Add("@InvoiceDate", SqlDbType.DateTime).Value = Convert.ToDateTime(InvoiceDate);
    com.Parameters.Add("@ProductName", SqlDbType.VarChar, 50).Value = ProductName;
    com.Parameters.Add("@Description", SqlDbType.VarChar, 150).Value = Description;
    com.Parameters.Add("@Qty", SqlDbType.Int).Value = Convert.ToInt32(Qty);
    com.Parameters.Add("@Amount", SqlDbType.Int).Value = Convert.ToInt32(Amount);
    com.Parameters.Add("@TaxAmount", SqlDbType.Int).Value = Convert.ToInt32(TaxAmount);
    com.Parameters.Add("@PaidAmount", SqlDbType.Int).Value = Convert.ToInt32(paidAmount);
    com.Parameters.Add("@CustomerName", SqlDbType.VarChar, 50).Value = CustomerName;
    com.Parameters.Add("@CustomerAddress", SqlDbType.VarChar, 150).Value = CustomerAddress;
    com.Parameters.Add("@UnitCost", SqlDbType.Int).Value = Convert.ToInt32(UnitCost);
    com.Parameters.Add("@InvoiceReference", SqlDbType.Int).Value = Convert.ToInt32(InvoiceReference);
     con.Open();
    com.ExecuteNonQuery();
    con.Close();                                                                                   

以上代码工作正常，此代码没有问题。