explain following coding in step by step

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Can anyone explain me following c# code in step by step:

public void update(string id)
   {
       string ids = Request.QueryString["ids"];
       Session["ID"] = ids.ToString();
       con.Open();
       SqlCommand cmd = new SqlCommand("select * from product where pro_id='" + ids + "'", con);
       SqlDataReader dr = cmd.ExecuteReader();
       if (dr.HasRows)
       {
           while (dr.Read())
           {
               txtpro_id.Text = dr["pro_id"].ToString();
               txtpro_name.Text = dr["pro_name"].ToString();
               txtdescription.Text = dr["description"].ToString();
               txtpriority.Text = dr["priority"].ToString();
               txtytubeurl.Text = dr["ytube_url"].ToString();
               txtprice.Text = dr["price"].ToString();
           }
           dr.Close();
       }
       con.Close();

Posted 13-Nov-11 17:51pm

M.Narmatha

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khan mohd faizan · Answer 1 · 2011-11-13T18:10:00

1-

C#

public void update(string id)

you writting a method by pasing one parameter as String Id

2-

C#

string ids = Request.QueryString["ids"];

you storing value in 'ids' from QueryString that come from somewhere like you passing value from one page to another using QueryString

3-

C#

Session["ID"] = ids.ToString();

you storing QueryString value in session

4- con.Open();
opening the connention by calling the connectionString value.

5-

C#

SqlCommand cmd = new SqlCommand("select * from product where pro_id='" + ids + "'", con);

firing the Query and Storing in SQLCommant Property

6-

C#

SqlDataReader dr = cmd.ExecuteReader();

executing the command using SQlDataReader. Data reader is read only one row and discard all other row

7-

C#

if (dr.HasRows)

HasRows is used to check dr has row or not.if dr contain row then it will go inside the loop

8-

C#

while (dr.Read())
            {
                txtpro_id.Text = dr["pro_id"].ToString();
                txtpro_name.Text = dr["pro_name"].ToString();
                txtdescription.Text = dr["description"].ToString();
                txtpriority.Text = dr["priority"].ToString();
                txtytubeurl.Text = dr["ytube_url"].ToString();
                txtprice.Text = dr["price"].ToString();
            }

setting the value to the control one by one

9-

C#

dr.Close();

closing the datareader

10-

C#

con.Close();

closing the connection