Loop variable name?

[loveforfire33]

Hi,

im trying to populate each datagrid with an individual record from a table by using a loop - ideally id like something like this below

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Data;
using System.Data.SqlClient;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

        {
            for (int i = 1; i <= 3; i++)
            {
// datatable dt + i means id like the datatable to be named dt and the i from the loop

                DataTable dt+i = new DataTable();
                String strConnString = System.Configuration.ConfigurationManager.
                    ConnectionStrings["conString"].ConnectionString;

// i think this sql part using i should work atleast
                string strQuery = "select ID, Name from tblFiles where id ='" + i + "'";
                SqlCommand cmd = new SqlCommand(strQuery);
                SqlConnection con = new SqlConnection(strConnString);
                SqlDataAdapter sda = new SqlDataAdapter();
                cmd.CommandType = CommandType.Text;
                cmd.Connection = con;
                try
                {
                    con.Open();
                    sda.SelectCommand = cmd;
                    sda.Fill(dt);

// dt1, dt2, dt3 are the result of the loop dt+i
                    GridView1.DataSource = dt1;
                    GridView1.DataBind();
                    GridView1.DataSource = dt2;
                    GridView1.DataBind();
                    GridView1.DataSource = dt3;
                    GridView1.DataBind();


                }
                catch (Exception ex)
                {
                    Response.Write(ex.Message);
                }
                finally
                {
                    con.Close();
                    sda.Dispose();
                    con.Dispose();
                    dt.Dispose();
                }
            }
        }
    }
}

i know this may be totally wrong - but im trying to indicate what im trying to acheive. i could implement this by simply copying the original code 3 times changing the sql statement and populating 1 grid with 1 copy. - but that seems like a awfull lot of repetition!

any ideas?

[PierlucSS]

There is two way of doing, with an array of DataTable or, which I reocmmed a DataSet

DataSet d = new DataSet();
            d.Tables.Add(new DataTable());

So basicly after you've filled your datatable, you add it to the dataset. you can also access a datatable with an indexer (string or int)

DataSet d = new DataSet();
     d.Tables[1];
     d.Tables["name_used_on_creation_of_datatable"];

[loveforfire33]

thanks for the reply. :)

what i dont understand is how i can populate a datatable to put into the dataset with just one row? and then make another datatable with just one row ... etc etc?

[PierlucSS]

Well if you want different different content in each table you need different queries which means you could pass the query as a parameter to your function as well as the string identifie of that table in the dataset.

public partial class Default2 : System.Web.UI.Page
{
    private DataSet set = new DataSet();

    protected void btn_Click(object sender, EventArgs e)
    {
          string query = "select ID, Name from tblFiles";
          addToDataSet(query, key);
    }

    private void addToDataSet(string query, string key)
    {
         // datatable dt + i means id like the datatable to be named dt and the i from the loop

                DataTable d = new DataTable(key);
                String strConnString = System.Configuration.ConfigurationManager.
                    ConnectionStrings["conString"].ConnectionString;

// i think this sql part using i should work atleast
                SqlCommand cmd = new SqlCommand(query);
                SqlConnection con = new SqlConnection(strConnString);
                SqlDataAdapter sda = new SqlDataAdapter();
                cmd.CommandType = CommandType.Text;
                cmd.Connection = con;
                try
                {
                    con.Open();
                    sda.SelectCommand = cmd;
                    sda.Fill(dt);


                }
                catch (Exception ex)
                {
                    Response.Write(ex.Message);
                }
                finally
                {
                    con.Close();
                    sda.Dispose();
                    con.Dispose();
                    dt.Dispose();
                    if(d != null) set.Tables.Add(d);
                }
    }
}