Database ADO.net

Fill data from Database to ListBox

Posted on by coder 
   
 


using System;
using System.Diagnostics;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

public class Form1 : System.Windows.Forms.Form {
    SqlConnection cn = new SqlConnection("data source=.;database=biblio;uid=admin;pwd=pw");
    SqlDataAdapter da = new SqlDataAdapter();
    string strSQL = "Select Title, PubID from Titles";
    SqlCommand cmd;
    SqlDataReader Dr;

    System.Windows.Forms.Button Button1 = new System.Windows.Forms.Button();
    System.Windows.Forms.ListBox ListBox1  = new System.Windows.Forms.ListBox();
    System.Windows.Forms.TextBox TextBox1  = new System.Windows.Forms.TextBox();

    public Form1() {
        cmd = new SqlCommand(strSQL, cn);
        this.SuspendLayout();

        this.Button1.Location = new System.Drawing.Point(136, 248);
        this.Button1.Size = new System.Drawing.Size(144, 32);
        this.Button1.Text = "Get Data";
        this.Button1.Click += new System.EventHandler(this.Button1_Click);

        this.ListBox1.Location = new System.Drawing.Point(48, 64);
        this.ListBox1.Size = new System.Drawing.Size(312, 160);

        this.TextBox1.Location = new System.Drawing.Point(48, 24);
        this.TextBox1.Size = new System.Drawing.Size(328, 20);
        this.TextBox1.Text = "Hit";

        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(408, 293);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.Button1,
                                                                          this.ListBox1,
                                                                          this.TextBox1});
        this.ResumeLayout(false);
    }

    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }

    private void Button1_Click(object sender, System.EventArgs e) {
        cn.Open(); 
        cmd.CommandText = strSQL + "'" + TextBox1.Text + "%'";
        Dr = cmd.ExecuteReader();
        ListBox1.Items.Clear(); 
        ListBox1.BeginUpdate();  

        while (Dr.Read()){
            ListBox1.Items.Add(Dr.GetString(0) + " - " + Dr.GetInt32(1).ToString());
        }

        ListBox1.EndUpdate();  

        Dr.Close();  

    }
}

Binding database table to ListBox and TextBox, link ListBox and TextBox

Posted on by coder 
   

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

    public class Form1 : System.Windows.Forms.Form {
      private System.Windows.Forms.ListBox listBox1;
      private System.Windows.Forms.TextBox textBox1;
      private System.Windows.Forms.TextBox textBox2;
      private System.Data.DataSet dataSet1;

      private System.ComponentModel.Container components = null;

      public Form1() {
        InitializeComponent();
      }

      private void InitializeComponent() {
         this.listBox1 = new System.Windows.Forms.ListBox();
         this.textBox1 = new System.Windows.Forms.TextBox();
         this.textBox2 = new System.Windows.Forms.TextBox();
         this.dataSet1 = new System.Data.DataSet();
         ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).BeginInit();
         this.SuspendLayout();

         this.listBox1.Location = new System.Drawing.Point(8, 8);
         this.listBox1.Name = "listBox1";
         this.listBox1.Size = new System.Drawing.Size(232, 95);
         this.listBox1.TabIndex = 0;

         this.textBox1.Location = new System.Drawing.Point(8, 120);
         this.textBox1.Name = "textBox1";
         this.textBox1.TabIndex = 1;
         this.textBox1.Text = "textBox1";

         this.textBox2.Location = new System.Drawing.Point(8, 152);
         this.textBox2.Name = "textBox2";
         this.textBox2.TabIndex = 2;
         this.textBox2.Text = "textBox2";

         this.dataSet1.DataSetName = "NewDataSet";
         this.dataSet1.Locale = new System.Globalization.CultureInfo("en-US");

         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(256, 188);
         this.Controls.Add(this.textBox2);
         this.Controls.Add(this.textBox1);
         this.Controls.Add(this.listBox1);
         this.Name = "Form1";
         this.Text = "Form1";
         this.Load += new System.EventHandler(this.Form1_Load);
         ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).EndInit();
         this.ResumeLayout(false);

      }
      static void Main() {
         Application.Run(new Form1());
      }

      private void Form1_Load(object sender, System.EventArgs e) {
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
  
         string sql = @"select firstname, lastname from employee ";

         SqlConnection conn = new SqlConnection(connString);
         SqlDataAdapter da = new SqlDataAdapter(sql, conn);
         da.Fill(dataSet1, "employee");
         DataTable dt = dataSet1.Tables["employee"];

         listBox1.DataSource = dt;
         listBox1.DisplayMember = "firstname";

         textBox1.DataBindings.Add("text", dt, "firstname");

         textBox2.DataBindings.Add("text", dt, "lastname");

      }
    }

Bind DataSet to Label

Posted on by coder 
   

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

   public class Form1 : System.Windows.Forms.Form {
      private System.Windows.Forms.Label label1;
      private System.Windows.Forms.Label label2;
      private System.Data.DataSet dataSet1;
 
      private System.ComponentModel.Container components = null;

      public Form1(){ 
 
         InitializeComponent();
      }

      private void InitializeComponent() {
         this.label1 = new System.Windows.Forms.Label();
         this.label2 = new System.Windows.Forms.Label();
         this.dataSet1 = new System.Data.DataSet();
         ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).BeginInit();
         this.SuspendLayout();
 
         this.label1.Location = new System.Drawing.Point(16, 8);
         this.label1.Name = "label1";
         this.label1.Size = new System.Drawing.Size(72, 16);
         this.label1.TabIndex = 0;
         this.label1.Text = "label1";
 
         this.label2.Location = new System.Drawing.Point(16, 40);
         this.label2.Name = "label2";
         this.label2.Size = new System.Drawing.Size(72, 16);
         this.label2.TabIndex = 1;
         this.label2.Text = "label2";
 
         this.dataSet1.DataSetName = "NewDataSet";
         this.dataSet1.Locale = new System.Globalization.CultureInfo("en-GB");
 
         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(128, 69);
         this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                      this.label2,
                                                                      this.label1});
         this.Name = "Form1";
         this.Text = "Form1";
         this.Load += new System.EventHandler(this.Form1_Load);
         ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).EndInit();
         this.ResumeLayout(false);

      }
 
      static void Main() {
         Application.Run(new Form1());
      }

      private void Form1_Load(object sender, System.EventArgs e) {
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
    
         string SQL = @"select * from employee";

         SqlConnection Conn = new SqlConnection(connString);
         SqlDataAdapter da = new SqlDataAdapter(SQL, Conn);

         da.Fill(dataSet1, "employee");

         // Bind the Label's Text property to the ProductID of the Products table
         label1.DataBindings.Add("Text", dataSet1, "employee.ID");
         // Bind the second label's Text property to the UnitPrice column
         label2.DataBindings.Add("Text", dataSet1, "employee.firstname");
      }
   }

Bind two DataGrids with many to many mapping

Posted on by coder 
   

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

    public class Form1 : System.Windows.Forms.Form{
      private System.Windows.Forms.DataGrid dataGrid1;
      private System.Data.DataSet dataSet1;
      private System.ComponentModel.Container components = null;

      public Form1() {
        InitializeComponent();
      }
      private void InitializeComponent(){
        this.dataGrid1 = new System.Windows.Forms.DataGrid();
        this.dataSet1 = new System.Data.DataSet();
        ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
        ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).BeginInit();
        this.SuspendLayout();

        this.dataGrid1.DataMember = "";
        this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
        this.dataGrid1.Location = new System.Drawing.Point(0, 0);
        this.dataGrid1.Name = "dataGrid1";
        this.dataGrid1.Size = new System.Drawing.Size(400, 200);
        this.dataGrid1.TabIndex = 0;

        this.dataSet1.DataSetName = "NewDataSet";
        this.dataSet1.Locale = new System.Globalization.CultureInfo("en-US");

        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(400, 196);
        this.Controls.Add(this.dataGrid1);
        this.Name = "Form1";
        this.Text = "Form1";
        this.Load += new System.EventHandler(this.Form1_Load);
        ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
        ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).EndInit();
        this.ResumeLayout(false);
      }
      [STAThread]
      static void Main() {
        Application.Run(new Form1());
      }

      private void Form1_Load(object sender, System.EventArgs e) {
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
         string qry1 = @"select * from employee ";
         string qry2 = @"select * from order";

         string sql = qry1 + qry2;

         SqlConnection conn = new SqlConnection(connString);
         SqlDataAdapter da = new SqlDataAdapter(sql, conn);
    
         da.TableMappings.Add("Table", "employee");
         da.TableMappings.Add("Table1", "order");
         da.Fill(dataSet1);

         DataRelation dr = new DataRelation(
            "employeeorders",
            dataSet1.Tables[0].Columns["employeeid"], 
            dataSet1.Tables[1].Columns["employeeid"]
            );
         dataSet1.Relations.Add(dr);

         dataGrid1.SetDataBinding(dataSet1, "employees");

      }
    }

DataGrid Update: edit a table by binding component

Posted on by coder 
   

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

    public class Form1 : System.Windows.Forms.Form {
      private System.Windows.Forms.DataGrid dataGrid1;
      private System.Windows.Forms.Button buttonUpdate;
      private System.Data.DataSet dataSet1;
      private System.Data.SqlClient.SqlCommand sqlCommand1;
      private System.ComponentModel.Container components = null;

      private SqlCommandBuilder cb;
      private SqlDataAdapter da;

      public Form1() {
         InitializeComponent();
      }
      private void InitializeComponent(){
         this.dataGrid1 = new System.Windows.Forms.DataGrid();
         this.buttonUpdate = new System.Windows.Forms.Button();
         this.dataSet1 = new System.Data.DataSet();
         this.sqlCommand1 = new System.Data.SqlClient.SqlCommand();
         ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
         ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).BeginInit();
         this.SuspendLayout();

         this.dataGrid1.DataMember = "";
         this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
         this.dataGrid1.Location = new System.Drawing.Point(8, 8);
         this.dataGrid1.Name = "dataGrid1";
         this.dataGrid1.Size = new System.Drawing.Size(440, 208);
         this.dataGrid1.TabIndex = 0;

         this.buttonUpdate.Location = new System.Drawing.Point(191, 232);
         this.buttonUpdate.Name = "buttonUpdate";
         this.buttonUpdate.TabIndex = 1;
         this.buttonUpdate.Text = "Update";
         this.buttonUpdate.Click += new System.EventHandler(this.buttonUpdate_Click);

         this.dataSet1.DataSetName = "NewDataSet";
         this.dataSet1.Locale = new System.Globalization.CultureInfo("en-US");

         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(456, 272);
         this.Controls.Add(this.buttonUpdate);
         this.Controls.Add(this.dataGrid1);
         this.Name = "Form1";
         this.Text = "Form1";
         this.Load += new System.EventHandler(this.Form1_Load);
         ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
         ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).EndInit();
         this.ResumeLayout(false);

      }
      static void Main() {
         Application.Run(new Form1());
      }

      private void Form1_Load(object sender, System.EventArgs e){
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
         string sql = @"select * from employee ";
         SqlConnection conn = new SqlConnection(connString);
         sqlCommand1 = new SqlCommand(sql, conn);

         da = new SqlDataAdapter();
         da.SelectCommand = sqlCommand1;

         cb = new SqlCommandBuilder(da);

         da.Fill(dataSet1, "employee");

         dataGrid1.SetDataBinding(dataSet1, "employee");
      }

      private void buttonUpdate_Click(object sender, System.EventArgs e) {
         da.Update(dataSet1, "employee"); 
      }
    }

Bind DataSet to DataGrid

Posted on by coder 
   

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.DataGrid dataGrid1;
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            InitializeComponent();
        }

        private void InitializeComponent(){
         this.dataGrid1 = new System.Windows.Forms.DataGrid();
         ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
         this.SuspendLayout();
         this.dataGrid1.DataMember = "";
         this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
         this.dataGrid1.Location = new System.Drawing.Point(8, 8);
         this.dataGrid1.Name = "dataGrid1";
         this.dataGrid1.Size = new System.Drawing.Size(608, 256);
         this.dataGrid1.TabIndex = 0;
         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(624, 272);
         this.Controls.Add(this.dataGrid1);
         this.Name = "Form1";
         this.Text = "Form1";
         this.Load += new System.EventHandler(this.Form1_Load);
         ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
         this.ResumeLayout(false);

      }

      static void Main() {
            Application.Run(new Form1());
      }

      private void Form1_Load(object sender, System.EventArgs e){
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";

         string sql = @"select * from employee";

         SqlConnection conn = new SqlConnection(connString);
         SqlDataAdapter da = new SqlDataAdapter(sql, conn);
         DataSet ds = new DataSet();
         da.Fill(ds, "customers");

         // Bind the data table to the data grid
         dataGrid1.SetDataBinding(ds, "customers");
      }
    }

Read comma separated value into DataSet

Posted on by coder

using System;
using System.Data;
using System.IO;

class Class1{
static void Main(string[] args){
DataSet myDataSet = GetData();
foreach (DataColumn c in myDataSet.Tables[“TheData”].Columns){
Console.Write(“{0,-20}”,c.ColumnName);
}
Console.WriteLine();

foreach (DataRow r in myDataSet.Tables[“TheData”].Rows)
{
foreach (DataColumn c in myDataSet.Tables[“TheData”].Columns)
{
Console.Write(“{0,-20}”,r);
}
Console.WriteLine();
}
}

private static DataSet GetData(){
string strLine;
string[] strArray;
char[] charArray = new char[] {','};
DataSet ds = new DataSet();
DataTable dt = ds.Tables.Add(“TheData”);
FileStream aFile = new FileStream(“csv.txt”,FileMode.Open);
StreamReader sr = new StreamReader(aFile);

strLine = sr.ReadLine();

strArray = strLine.Split(charArray);

for(int x=0;x<=strArray.GetUpperBound(0);x++) { dt.Columns.Add(strArray[x].Trim()); } strLine = sr.ReadLine(); while(strLine != null) { strArray = strLine.Split(charArray); DataRow dr = dt.NewRow(); for(int i=0;i<=strArray.GetUpperBound(0);i++) { dr[i] = strArray[i].Trim(); } dt.Rows.Add(dr); strLine = sr.ReadLine(); } sr.Close(); return ds; } } // File: csv.txt /* 1,2,3,4 5,6,7,8 */ [/csharp]