从数据库中读取数据并将其显示在文本字段中

Question

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

public partial class _Default : System.Web.UI.Page
{
protected void Button1_Click(object sender, EventArgs e)
{
    SqlConnection conn = new SqlConnection(
        "Data Source=PTZ1\\SQLEXPRESS;Initial Catalog = test; Integrated Security=SSPI;User ID=sa; Password=sa@; Trusted_Connection=True;");

    DataSet ds = new DataSet();
    SqlDataAdapter adapter = new SqlDataAdapter();
    try
    {
        conn.Open();
        SqlCommand cmd = new SqlCommand("select * from testing", conn);
        adapter.SelectCommand = cmd;
        adapter.Fill(ds, "First Table");

       foreach (DataTable tables in ds.Tables)
        {
            ListBox1.Items.Add(tables.TableName);

        }
       conn.Close();
    }
    catch (Exception ex)
    {
        Label1.Text = "Error in execution " + ex.ToString();
    }
}

}

I have the following program where I'm reading the values from the table and want to display the table values in a text field upon button click. Now when I click on the button, it just keeps on displaying first table in the listbox.

Can someone guide me through my error?

Answer 1

I suppose you need to display the Values existing in the DataRow of a DataTable . In the code snippet below, columnName is referring to the Column of the testing Table , that you want to show in the ListBox .

foreach (DataRow row in ds.Tables["First Table"].Rows)
{
    ListBox1.Items.Add(row["columnName"].ToString());
}

OR

foreach (DataRow row in ds.Tables[0].Rows)
{
    ListBox1.Items.Add(row["columnName"].ToString());
}

Answer 2

tables.TableName gives the name of the table which is "First Table" itself.So,it keeps on showing the same.

Better use this code.

    if(!ds.Tables.Count>1)
 { 
foreach (DataRow row in ds.Tables[0].Rows) 
{
        ListBox1.Items.Add(row["columnName"].ToString());
 } 
}

Answer 3

       SqlCommand cmd = new SqlCommand("select * from testing", conn);
            MySqlDataReader msqlreader = cmd.ExecuteReader();
            while (msqlreader.Read())
            { 
            listBox1.Items.Add(msqlreader(0);
            }

Im not sure if this is what you need, but hope it helps