using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;
public class MasterDetail : System.Windows.Forms.Form
{
public MasterDetail()
{
this.lstCategories = new System.Windows.Forms.ListBox();
this.lstProducts = new System.Windows.Forms.ListBox();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
this.lstCategories.Location = new System.Drawing.Point(8, 28);
this.lstCategories.Size = new System.Drawing.Size(140, 225);
this.lstCategories.TabIndex = 0;
this.lstCategories.SelectedIndexChanged += new System.EventHandler(this.lstCategories_SelectedIndexChanged);
//
this.lstProducts.Location = new System.Drawing.Point(152, 28);
this.lstProducts.Size = new System.Drawing.Size(252, 225);
this.lstProducts.TabIndex = 1;
//
this.label1.Location = new System.Drawing.Point(8, 8);
this.label1.Size = new System.Drawing.Size(108, 16);
this.label1.TabIndex = 2;
this.label1.Text = "Category:";
//
this.label2.Location = new System.Drawing.Point(152, 8);
this.label2.Size = new System.Drawing.Size(108, 16);
this.label2.TabIndex = 3;
this.label2.Text = "Products:";
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
this.ClientSize = new System.Drawing.Size(412, 266);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.label2,
this.label1,
this.lstProducts,
this.lstCategories});
this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.Text = "A Master-Detail Form";
this.Load += new System.EventHandler(this.MasterDetail_Load);
this.ResumeLayout(false);
}
string connectionString = "Data Source=localhost;Initial Catalog=Northwind;Integrated Security=SSPI";
string categorySQL = "SELECT * FROM Categories";
string productSQL = "SELECT * FROM Products";
DataSet ds = new DataSet();
DataRelation relation;
private System.Windows.Forms.ListBox lstCategories;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.ListBox lstProducts;
public static void Main()
{
Application.Run(new MasterDetail());
}
private void MasterDetail_Load(object sender, System.EventArgs e)
{
SqlConnection con = new SqlConnection(connectionString);
SqlCommand com = new SqlCommand(categorySQL, con);
SqlDataAdapter adapter = new SqlDataAdapter(com);
con.Open();
adapter.Fill(ds, "Categories");
adapter.SelectCommand.CommandText = productSQL;
adapter.Fill(ds, "Products");
con.Close();
DataColumn parentCol = ds.Tables["Categories"].Columns["CategoryID"];
DataColumn childCol = ds.Tables["Products"].Columns["CategoryID"];
relation = new DataRelation("Cat_Prod", parentCol, childCol);
ds.Relations.Add(relation);
foreach (DataRow row in ds.Tables["Categories"].Rows)
{
lstCategories.Items.Add(row["CategoryName"]);
}
}
private void lstCategories_SelectedIndexChanged(object sender, System.EventArgs e)
{
lstProducts.Items.Clear();
DataRow[] rows = ds.Tables["Categories"].Select("CategoryName='" + lstCategories.Text + "'");
DataRow parent = rows[0];
foreach (DataRow child in parent.GetChildRows(relation))
{
lstProducts.Items.Add(child["ProductName"]);
}
}
}
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