title: Select data from SQL based on specific values using C# perform operations
body: <p>I need to select data saved on the basis of different ages, design alternatives and experiences in SQL using C#. The operations are performed in the data using for loop and the loop runs for all the IDs with the specified Age, Design alternative and experience. The code is attached.
  The results I am getting are the same for every age or design alternatives entered.</p>
  
  <pre><code> public partial class Form3 : Form
  {
      SqlCommand cnd;
      SqlConnection conn = new SqlConnection(@"Data Source=HAIER-PC;Initial Catalog=c_util;Integrated Security=True");
      int[] R = new int[10];
      double[] W = { 4.11, 2.21, 3.42, 3.01, 2.34, 4.10,3.03, 1.18, 1.99, 5.03 };
      double[] S = new double[10];
      double sum;
      double[] wp1= new double[10];
      double[] squ= new double[10];
      double[] l = new double[10];
      double learn = 0.5;
      int op;
      int ID;
      public Form3()
      {
          InitializeComponent(); 
      }
     private void button8_Click(object sender, EventArgs e)
      {
  
          int n;
          if (conn.State != ConnectionState.Open)
          conn.Open();
          cnd = new SqlCommand("select * from CDes where Age='" + comboBox1.Text + "' AND Exper='" + comboBox2.Text + "'AND Design='" + comboBox3.Text + "'  ", conn);
          SqlDataReader myreader = cnd.ExecuteReader();
          int[] R = new int[10];
              while (myreader.Read())
              {
                  string id = myreader.GetInt32(0).ToString();
                  string shell = myreader.GetInt32(4).ToString();
                  string baseg = myreader.GetInt32(5).ToString();
                  string vnt = myreader.GetInt32(6).ToString();
                  string price = myreader.GetInt32(7).ToString();
                  string impactliner = myreader.GetInt32(8).ToString(); ;
                  string eyeport = myreader.GetInt32(9).ToString();
                  string face = myreader.GetInt32(10).ToString();
                  string comfort = myreader.GetInt32(11).ToString();
                  string strap = myreader.GetInt32(12).ToString();
                  string wgt = myreader.GetInt32(13).ToString();
                  ID = Convert.ToInt32(id);
                  R[0] = Convert.ToInt32(shell);
                  R[1] = Convert.ToInt32(baseg);
                  R[2] = Convert.ToInt32(vnt);
                  R[3] = Convert.ToInt32(price);
                  R[4] = Convert.ToInt32(impactliner);
                  R[5] = Convert.ToInt32(eyeport);
                  R[6] = Convert.ToInt32(face);
                  R[7] = Convert.ToInt32(comfort);
                  R[8] = Convert.ToInt32(strap);
                  R[9] = Convert.ToInt32(wgt);
              }
              //Kohonen
  
               for ( n = 0; n &lt;=ID; n++)
  
               {
  
  
              S[0] = R[0] - W[0];
              squ[0] = Math.Pow(S[0], 2);
              S[1] = R[1] - W[1];
              squ[1] = Math.Pow(S[1], 2);
              S[2] = R[2] - W[2];
              squ[2] = Math.Pow(S[2], 2);
              S[3] = R[3] - W[3];
              squ[3] = Math.Pow(S[3], 2);
              S[4] = R[4] - W[4];
              squ[4] = Math.Pow(S[4], 2);
              S[5] = R[5] - W[5];
              squ[5] = Math.Pow(S[5], 2);
              S[6] = R[6] - W[6];
              squ[6] = Math.Pow(S[6], 2);
              S[7] = R[7] - W[7];
              squ[7] = Math.Pow(S[7], 2);
              S[8] = R[8] - W[8];
              squ[8] = Math.Pow(S[8], 2);
              S[9] = R[9] - W[9];
              squ[9] = Math.Pow(S[9], 2);
              sum = squ[0] + squ[1] + squ[2] + squ[3] + squ[4] + squ[5] + squ[6] + squ[7] + squ[8] + squ[9];
  
              if (sum &gt;= 75)
              {
                  op = 1;
              }
              else
              {
                  op = 0;
              }
              wp1[0] = W[0] + (learn * op * S[0]);
              wp1[1] = W[1] + (learn * op * S[1]);
              wp1[2] = W[2] + (learn * op * S[2]);
              wp1[3] = W[3] + (learn * op * S[3]);
              wp1[4] = W[4] + (learn * op * S[4]);
              wp1[5] = W[5] + (learn * op * S[5]);
              wp1[6] = W[6] + (learn * op * S[6]);
              wp1[7] = W[7] + (learn * op * S[7]);
              wp1[8] = W[8] + (learn * op * S[8]);
              wp1[9] = W[9] + (learn * op * S[9]);
              }
  
              myreader.Close();
              conn.Close();
  
          textBox13.Text = wp1[0].ToString();
          textBox14.Text =wp1[1].ToString();
          textBox15.Text = wp1[2].ToString();
          textBox20.Text = wp1[3].ToString();
          textBox16.Text = wp1[4].ToString();
          textBox21.Text = wp1[5].ToString();
          textBox17.Text = wp1[6].ToString();
          textBox22.Text = wp1[7].ToString();
          textBox18.Text = wp1[8].ToString();
          textBox23.Text = wp1[9].ToString();
  
  
      }
  </code></pre>