新人自学C Sharp 碰到问题要问
Hi ALL，


有以下代码出错了，同样的代码在另一表格中可就可执行，不明白问下各位。

C# code

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace HY_New{    public partial class frmProCla : Form    {        public frmProCla()        {            InitializeComponent();        }        private void ChangeEnableState()         {            proClassTableBindingNavigator.Enabled = !proClassTableBindingNavigator.Enabled;                        gbEdit.Enabled = !gbEdit.Enabled;                       foreach (ToolStripButton b in tsControl.Items)            {                b.Enabled = !b.Enabled;            }        }        private void frmProCla_Load(object sender, EventArgs e)        {            // TODO: 这行代码将数据加载到表“_DsHY_new.Department”中。您可以根据需要移动或删除它。            this.departmentTableAdapter.Fill(this._DsHY_new.Department);            // TODO: 这行代码将数据加载到表“_DsHY_new.ProClassTable”中。您可以根据需要移动或删除它。            this.proClassTableTableAdapter.Fill(this._DsHY_new.ProClassTable);        }       private void tsbInsert_Click(object sender, EventArgs e)        {            ChangeEnableState();            proClassTableBindingSource.AddNew();            proClassNameTextBox.Focus();        }        private void tsbEdit_Click(object sender, EventArgs e)        {            ChangeEnableState();            proClassNameTextBox.Focus();        }        private void tsbDelete_Click(object sender, EventArgs e)        {            if (proClassTableBindingSource.Current != null)            {                if (MessageBox.Show("确实要删除吗?", "确认", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)                {                    proClassTableBindingSource.RemoveCurrent();                    [color=#0000FF]this.tableAdapterManager.UpdateAll(this._DsHY_new);[/color]                    //此处出错                }            }        }        private void tsbSave_Click(object sender, EventArgs e)        {            ChangeEnableState();            this.Validate();            this.proClassTableBindingSource.EndEdit();            this.tableAdapterManager.UpdateAll(this._DsHY_new);            //此处在新增时保存通过，在修改时保存出错。        }        private void tsbCancel_Click(object sender, EventArgs e)        {            ChangeEnableState();            this.proClassTableBindingSource.CancelEdit();        }    }}