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trackbar help

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I have a form with three textboxes, three trackbars, and a button. The idea is to have the user enter a value into the three textboxes and click the button at which time each of the trackbars would slide to appropriate value based on the numbered entered into the textbox. However, I haven't been able to achieve that. When the user clicks the button the slider remains at zero.   How do I get it to slide when the user clicks the button?

   private void button19_Click(object sender, EventArgs e)
        {


                Double number;
                Double max = 50000d;
                Double.TryParse(test4.Text, out number);

                Double result = number / 3;

                textBox1.Text = String.Format("{0:0}", max);
                Double remainder = Double.Parse(test4.Text) - (Double.Parse(textBox1.Text) * 2);
                textBox1.Text = String.Format("{0:0}", remainder);


            }

            }
            textBox2.Text = textBox3.Text;
                   }

           private void trackBar2_Scroll_1(object sender, EventArgs e)

            {

                      textBox1.Text = "" + trackBar2.Value;

            }

                      private void trackBar3_Scroll_1(object sender, EventArgs e)

            {

                      textBox2.Text = "" + trackBar3.Value;

             }

                      private void trackBar1_Scroll_1(object sender, EventArgs e)

             {

                      textBox3.Text= "" + trackBar1.Value;

             }

Saturday, September 12, 2009 1:48 PM

Answers

You first of all need to put your TryParse in an if statement because what happens it it doesn't parse out to a double? Then you are in trouble.

//example

if (Double.TryParse(test4.Text, out number))
{
.........
}

Fix that first, and make the rest of the functionality is in that if statement.

Here is an example of a Trackbar functionality. It has a label, three Trackbar, and a pictureBox. When you adjust the TrackBar, it adjusts the RGB color on the pictureBox

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            tbBlue.Value = 0;
            tbGreen.Value = 0;
            tbRed.Value = 0;
            UpdateColor();
        }

        private void Scoll(object sender, EventArgs e)
        {
            UpdateColor();
        }
      

        private void UpdateColor()
        {
            Color c = Color.FromArgb(tbRed.Value, tbGreen.Value, tbBlue.Value);
            colorBox.BackColor = c;
            lblCurrColor.Text = "Current color is: (" + tbRed.Value + ", " + tbGreen.Value + " ," + tbBlue.Value + ")";           
        }

    }
}

John Grove - TFD Group, Senior Software Engineer, EI Division, http://www.tfdg.com

Marked as answer by KINGM56 Sunday, September 13, 2009 6:06 PM

Saturday, September 12, 2009 2:32 PM

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trackbar help

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