Check Boxes and Combo Boxes together

Question

0.00/5 (No votes)

See more:

Hi,
I am learning C#. For one of my school project I need to create a window form where I've multiple check boxes and each check box has one combo box in front of it. If the user checked the check box then he must select a value from the combo box too.

when user click OK button then system must check if there is atleast one check box is checked and the associated combo is filled, if not then show error. Being a starter only I dont have any idea how to do this. Please help me

Thanks
James

Posted 12-Jan-15 23:09pm

James@SysSol

Add a Solution

Comments

Sibasisjena 13-Jan-15 5:22am

Hi James,
Which control you have used.
1. A list of CheckBox control
2. A CheckedListBox control

2 solutions

Solution 2

Consider you have 3 checkboxes and 3 comboboxes on form and one button. On button click you want to validate the case. Please find below code.

C#

private void button1_Click(object sender, EventArgs e)
        {
            //check if no checkbox is selected
            if (!(checkBox1.Checked || checkBox2.Checked || checkBox3.Checked))
            {
                MessageBox.Show("No Checkbox is slected");
            }
            else
            {
                string status = "";
                if (checkBox1.Checked) { status += CheckRespectiveComboboxSelected(comboBox1, "First"); }
                if (checkBox2.Checked) { status += CheckRespectiveComboboxSelected(comboBox2, "Second"); }
                if (checkBox3.Checked) { status += CheckRespectiveComboboxSelected(comboBox3, "Third"); }

                if (status != "")
                    MessageBox.Show(status);
                else
                    MessageBox.Show("Success");
            }
        }

        private string CheckRespectiveComboboxSelected(ComboBox cmb, string s)
        {
            if (cmb.Text == "" || cmb.SelectedIndex == 0) //first item of combobox is --select--
            {
                return "Please select item from " + s + " combobox.\n";
            }
            return "";
        }

Posted 12-Jan-15 23:32pm

Praveen Kumar Upadhyay

Comments

James@SysSol 13-Jan-15 5:38am

Hi,
This is great but I have 25 check and combo boxes in one form.... so do I've to write 25 lines for each check boxes and is it possible to do it by other way.

Thanks in advance.

James@SysSol 13-Jan-15 20:45pm

Thank you all for your great work and support.

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Peter Leow · Accepted Answer · 2015-01-12T23:23:00

Check the checked property of the checkbox (==true) and the selectedindex of the combox (>-1), e.g.

SQL

if (checkBox1.Checked && comboBox1.SelectedIndex > -1) {
    // do something
}

refer:
1. CheckBox.Checked Property[^]
2. ComboBox.SelectedIndex Property[^]
+++++++++++[round 2]+++++++++
You can create checkboxes and comboxes and placed them in separate List objects. Then insert a button on your form, in the click event handler of this button, loop through both list objects and check the condition for compliance. Try this:

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 WindowsFormsApplicationCS
{
    public partial class Form16 : Form
    {
        // declare List to store checkboxes and comboxes
        List<CheckBox> checkboxList = new List<CheckBox>();
        List<ComboBox> comboboxList = new List<ComboBox>();

        public Form16()
        {
            InitializeComponent();
        }

        private void Form16_Load(object sender, EventArgs e)
        {
            int j = 1;
            int k = 1;

            for (int i = 1; i <= 25; i++)
            {
                CheckBox chkBox = new CheckBox();

                chkBox.Tag = i.ToString();
                chkBox.Name = "Slot" + i;
                if (i <= 9)
                { chkBox.Text = "Slot0" + i; }
                else 
                { chkBox.Text = "Slot" + i; }


                if (i <= 13)
                { chkBox.Location = new Point(10, j * 20);}
                else
                { chkBox.Location = new Point(210, k * 20);  }


                this.Controls.Add(chkBox);

                // add this checkbox to the list
                checkboxList.Add(chkBox);

                ComboBox cmbBox = new ComboBox();
                cmbBox.Tag = i.ToString();
                cmbBox.Name = "Mode" + i;
                cmbBox.Items.Add("REGULAR STUDENT");
                cmbBox.Items.Add("VOCATIONAL STUDENT");

                cmbBox.AutoSize = true;
                if (i <= 13)
                { cmbBox.Location = new Point(70, j * 20); j++; }
                else { cmbBox.Location = new Point(270, k * 20); k++; }
                this.Controls.Add(cmbBox);

                // Add this combox to the list
                comboboxList.Add(cmbBox);
                
            }

        }

        private void button1_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < checkboxList.Count; i++)
            {
                if (checkboxList[i].Checked && comboboxList[i].SelectedIndex == -1)
                {
                    MessageBox.Show("You have checked "+ checkboxList[i].Name +" but forget to select " + comboboxList[i].Name);
                }
            }
        }
    }
}