private void button1_Click(object sender, EventArgs e) { StringBuilder stb = new StringBuilder(textBox1.Text).Append(Constant.SPLIT1); stb.Append(dateTimePicker1.Value.ToString("yyyy-MM-dd HH:mm")).Append(Constant.SPLIT1); stb.Append(dateTimePicker2.Value.ToString("yyyy-MM-dd HH:mm")).Append(Constant.SPLIT1); stb.Append(textBox2.Text); FormMain.C_Query_Operation(stb.ToString()); }