direnç

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Linq.Expressions;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace direnç_hesaplama

{

  public partial class Form1 : Form

  {

    public Form1()

    {

      InitializeComponent();

    }

    private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)

    {

      if (comboBox1.SelectedIndex == 0)

      {

        button2.BackColor = Color.Black;

      }

      else if (comboBox1.SelectedIndex == 1)

      {

        button2.BackColor = Color.Brown;

      }

      else if (comboBox1.SelectedIndex == 2)

      {

        button2.BackColor = Color.Red;

      }

      else if (comboBox1.SelectedIndex == 3)

      {

        button2.BackColor = Color.Orange;

      }

      else if (comboBox1.SelectedIndex == 4)

      {

        button2.BackColor = Color.Yellow;

      }

      else if (comboBox1.SelectedIndex == 5)

      {

        button2.BackColor = Color.Green;

      }

      else if (comboBox1.SelectedIndex == 6)

      {

        button2.BackColor = Color.Blue;

      }

      else if (comboBox1.SelectedIndex == 7)

      {

        button2.BackColor = Color.Purple;

      }

      else if (comboBox1.SelectedIndex == 8)

      {

        button2.BackColor = Color.Gray;

      }

      else

      {

        button2.BackColor = Color.White;

      }

    }

    private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)

    {

      if (comboBox2.SelectedIndex == 0)

      {

        button3.BackColor = Color.Black;

      }

      else if (comboBox2.SelectedIndex == 1)

      {

        button3.BackColor = Color.Brown;

      }

      else if (comboBox2.SelectedIndex == 2)

      {

        button3.BackColor = Color.Red;

      }

      else if (comboBox2.SelectedIndex == 3)

      {

        button3.BackColor = Color.Orange;

      }

      else if (comboBox2.SelectedIndex == 4)

      {

        button3.BackColor = Color.Yellow;

      }

      else if (comboBox2.SelectedIndex == 5)

      {

        button3.BackColor = Color.Green;

      }

      else if (comboBox2.SelectedIndex == 6)

      {

        button3.BackColor = Color.Blue;

      }

      else if (comboBox2.SelectedIndex == 7)

      {

        button3.BackColor = Color.Purple;

      }

      else if (comboBox2.SelectedIndex == 8)

      {

        button3.BackColor = Color.Gray;

      }

      else

      {

        button3.BackColor = Color.White;

      }

    }

    private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)

    {

      if (comboBox3.SelectedIndex == 0)

      {

        button4.BackColor = Color.Black;

      }

      else if (comboBox3.SelectedIndex == 1)

      {

        button4.BackColor = Color.Brown;

      }

      else if (comboBox3.SelectedIndex == 2)

      {

        button4.BackColor = Color.Red;

      }

      else if (comboBox3.SelectedIndex == 3)

      {

        button4.BackColor = Color.Orange;

      }

      else if (comboBox3.SelectedIndex == 4)

      {

        button4.BackColor = Color.Yellow;

      }

      else if (comboBox3.SelectedIndex == 5)

      {

        button4.BackColor = Color.Green;

      }

      else if (comboBox3.SelectedIndex == 6)

      {

        button4.BackColor = Color.Blue;

      }

      else if (comboBox3.SelectedIndex == 7)

      {

        button4.BackColor = Color.Purple;

      }

      else if (comboBox3.SelectedIndex == 8)

      {

        button4.BackColor = Color.Gray;

      }

      else

      {

        button4.BackColor = Color.White;

      }

    }

    private void button1_Click(object sender, EventArgs e)

    {

      try

      {

        double Renk1, Renk2, Renk3, ohm, khom;

        Renk1 = comboBox1.SelectedIndex;

        Renk2 = comboBox2.SelectedIndex;

        Renk3 = comboBox3.SelectedIndex;

        string birlesim = Renk1.ToString() + Renk2.ToString();

        ohm = Convert.ToDouble(birlesim) * Math.Pow(10, Renk3);

        khom = ohm / 1000;

        label6.Text = ohm.ToString(); label8.Text = khom.ToString();

      }

      catch (Exception)

      {

        MessageBox.Show("boş alan bırakmayınız");

      }

    }

  }

}