C#编写的windows计算器-源代码(22) this.btn_sqr.ForeColor = System.Drawing.Color.Blue; this.btn_sqr.Location = new System.Drawing.Point(98, 16); this.btn_sqr.Name = "btn_sqr"; this.btn_sqr.Size = new System.Drawing.Size(36, 29); this.btn_sqr.TabIndex = 19; this.btn_sqr.Text = "sqr"; this.btn_sqr.Click += new System.EventHandler(this.btn_Oper); // // mainMenu1 // this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] { this.menuItem8, this.menuItem1,