first program in c#
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  1. #1
    Join Date
    Dec 2008
    Posts
    13

    first program in c#

    I am trying to pick up c# and was wondering if someone could show me what I am doing wrong. In the code below I have three radio buttons(go, slow down, and stop). I also have a checkbox is show the results of what the car is doing when each radio button is checked. When I run the program there is nothing in the textbox and just wanting to see if someone can take a quick look and what is wrong...

    Code:
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
    
    namespace Making_Decisions_Winforms1
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
    
            private void Form1_Load(object sender, EventArgs e)
            {
    
            }
    
            void DoTrafficLight(string color)
            {
                switch (color)
                {
                    case "green":
                        textBox1.Text = "The car is moving!";
                        //tmrYellow.Enabled = true;
                        break;
                    case "yellow":
                        textBox1.Text = "The car is slowing down!";
                        tmrYellow.Enabled = true;
                        break;
                    case "red":
                        textBox1.Text = "The car has stopped!";
                        tmrYellow.Enabled = false;
                        break;
                }
            }
    
            private void greenRadioButton1_CheckedChanged(object sender, EventArgs e)
            {
                if (greenRadioButton1.Checked == true)
                {
                    DoTrafficLight("green");
                    
                }
            }
    
            private void yellowRadioButton1_CheckedChanged(object sender, EventArgs e)
            {
                if (yellowRadioButton1.Checked == true)
                {
                    DoTrafficLight("yellow");
                }
    
            }
    
            private void redRadioButton1_CheckedChanged(object sender, EventArgs e)
            {
                if (redRadioButton1.Checked == true)
                {
                    DoTrafficLight("red");
                }
            }
    
        }
    }

  2. #2
    Join Date
    Oct 2004
    Location
    Rocket City
    Posts
    220

    Re: first program in c#

    This will probably not completely solve your problem, but notice that clicking a RadioButton will fire not one but two of those CheckedChanged events. You need to have one _CheckedChanged assigned to all three, with all three of the if (x.Checked) snippets in the one event handler.

  3. #3
    Join Date
    Nov 2011
    Posts
    36

    Re: first program in c#

    So what I am seeing here is that whichever radio button is check the textBox1 will display the strings you have defined. You should be seeing that text. Now, I do not see anything about a checkbox you mentioned to show results? I threw something together real quick that should work very similar to yours:

    Code:
    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 TestTraffic
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
    
            private void RadioBtn_CheckedChanged(object sender, EventArgs e)
            {
                if (greenRadioBtn.Checked)
                    DoTrafficLight("green");
                if (yellowRadioBtn.Checked)
                    DoTrafficLight("yellow");
                if (redRadioBtn.Checked)
                    DoTrafficLight("red");
            }
    
            void DoTrafficLight(string color)
            {
                switch (color)
                {
                    case "green":
                        if (chkBox1.Checked) //Show "car status" check box
                            textBox1.Text = "The car is moving!";
                        //tmrYellow.Enabled = true;
                        break;
                    case "yellow":
                        if (chkBox1.Checked)
                            textBox1.Text = "The car is slowing down!";
                        //tmrYellow.Enabled = true;
                        break;
                    case "red":
                        if (chkBox1.Checked)
                            textBox1.Text = "The car has stopped!";
                        //tmrYellow.Enabled = false;
                        break;
                }
            }
    
            private void chkBox1_CheckedChanged(object sender, EventArgs e)
            {
                if (!chkBox1.Checked)
                    textBox1.Clear();
                else
                {                
                    //Show status of car with current radio button that is already checked when open program
                }
            }
    
            private void Form1_Load(object sender, EventArgs e)
            {           
            }
        }
    }
    Also what Zips mentioned is correct, you only need one _CheckChanged assigned to all three. But the form automatically generates a new one for every radio button you double click. That will work but creates code that is not necessarily needed.
    Last edited by Deranged; November 14th, 2012 at 03:36 PM.

  4. #4
    Join Date
    Dec 2008
    Posts
    13

    Post Re: first program in c#

    I apologize I actually made a typo in my first post. There is not a checkbox in my program. Under the form layout, I just have a groupbox with 3 radio buttons in it (green, yellow, and red). I also have a textbox that should show the results so no checkbox is used.

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