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C# combox下拉框绑定数据库数据 // 向年级表的第1行添加数据“全部” DataRow row = ds.Tables["Grade"].NewRow(); row[0] = -1; row[1] = "全部"; ds.Tables["Grade"].Rows.InsertAt(row, 0); // 绑定要插入的数据 this.cboGrade.DataSource = ds.Tables["Grade"]; this.cboGrade.ValueMember = "GradeId"; this

使用MessageBox为窗体添加友好提示 private void off_Click(object sender, EventArgs e) { DialogResult a = MessageBox.Show("您*******", "死亡提醒", MessageBoxButtons.YesNo, MessageBoxIcon.Warning); if (a == DialogResult.Yes) {