关于在DataGrid里添加ComboBox（二）

忘记说了一和二共同组成form2.cs文件
//
       // btnUpdate
       //
       this.btnUpdate.Anchor = (System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right);
       this.btnUpdate.Location = new System.Drawing.Point(456, 264);
       this.btnUpdate.Name = "btnUpdate";
       this.btnUpdate.Size = new System.Drawing.Size(80, 24);
       this.btnUpdate.TabIndex = 1;
       this.btnUpdate.Text = "Update";
       this.btnUpdate.Click += new System.EventHandler(this.btnUpdate_Click);
       //
       // btnMoveNext
       //
       this.btnMoveNext.Anchor = (System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left);
       this.btnMoveNext.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
       this.btnMoveNext.Location = new System.Drawing.Point(96, 264);
       this.btnMoveNext.Name = "btnMoveNext";