老大，我更改了一下大概是这样的：
 public bool AddcalMainRecords(string equipment_Name,int use_Place_ID, DateTime cal_Date, DateTime due_Date, string vender, string brand, string model, string serial_NO, string accuracy, string myclass, string status, string wI_NO, string drawing_NO, string remark)
    {
        // 新建一个calMainRecordsRow实例
        cal.calMainRecordsDataTable mycals = new cal.calMainRecordsDataTable();
        cal.calMainRecordsRow mycal = mycals.NewcalMainRecordsRow();
        if (equipment_Name == null) mycal.SetEquipment_NameNull(); else mycal.Equipment_Name = equipment_Name;
        mycal.use_Place_ID//正常这里是应该可以打入mycal.Use_Place_ID的，也就是在mycal后面打个.之后会出来Use_Place_ID给我选择的，但是这里没有出来，而我又在参数那里定义了的。

最新代码：
 public bool AddcalMainRecords(string equipment_Name, DateTime cal_Date, DateTime due_Date, string vender, string brand, string model, string serial_NO, string accuracy, string myclass, string status, string wI_NO, string drawing_NO, string remark)
    {
        // 新建一个calMainRecordsRow实例
        cal.calMainRecordsDataTable mycals = new cal.calMainRecordsDataTable();
        cal.calMainRecordsRow mycal = mycals.NewcalMainRecordsRow();
        if (equipment_Name == null) mycal.SetEquipment_NameNull(); else mycal.Equipment_Name = equipment_Name;
        mycal.Cal_Date = cal_Date;
        mycal.Due_Date = due_Date;

        if (vender == null) mycal.SetVenderNull(); else mycal.Vender = vender;
        if (brand == null) mycal.SetBrandNull(); else mycal.Brand = brand;
        if (model == null) mycal.SetModelNull(); else mycal.Model = model;
        if (serial_NO == null) mycal.SetSerial_NONull(); else mycal.Serial_NO = serial_NO;
        if (accuracy == null) mycal.SetAccuracyNull(); else mycal.Accuracy = accuracy;
        mycal.Class = myclass;
        mycal.Status = status;
        mycal.WI_NO = wI_NO;

        if (drawing_NO == null) mycal.SetDrawing_NONull(); else mycal.Drawing_NO = drawing_NO;

        if (remark == null) mycal.SetRemarkNull(); else mycal.Remark = remark;
        mycals.AddcalMainRecordsRow(mycal);
        int rowsAffected = Adapter.Update(mycals);
        // 如果刚好新增了一条记录，则返回true，否则返回false
        return rowsAffected == 1;
    }

当我单击“插入”的时候，输入ID:T0005:,Cal_Date:2010-12-24,Due_Date:2010-12-24,其它留空或者随便输入字符，点击插入，都是提示：“输入字符串的格式不正确”
要疯了！

老大,还在纠结中啊!!!

看了一下 ,那是因为你没有做验证...本来是int类型的数据,你在文本框里面输入"sss",插入数据库中的时候sss无法转换为int类型,因此报错!!!