Command object in ADO.NET

Question

Hi Guys I have a problem in ADO.NET. What is Command object in ADO.NET and how to use it with data adapter.. Thank You....

Prabhu Raja · Answer

Hi Aaron About Command Object : Command objects are used to perform data manipulation inside of sql server (Backend) from .net(Front End). Using Command objects we can Execute our Sql Query's Like Insertupdatedelete and Select etc. Also We Execute Procedures. Also We can pass parameters to procedures. About Data Adapters: Data Adapters having set of objects to communicate with data source and dataset. For example: try { SqlConnection con = new SqlConnection(Your Connection String); SqlCommand cmd = new SqlCommand(select getDate() as name); //Command object for Sql Server con.Open(); cmd.Connection = con; SqlDataAdapter da = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); da.Fill(ds); GridView_doctor.DataSource = ds; GridView_doctor.DataBind(); } catch (Exception ex) { //Exception Handling } ------------------------------------------------------------------- If this post helps you then mark as Correct Answer Thank You Prabhu Raja

Satyapriya Nayak · Answer

Hi Aaron Command object:-A database command specifies which particular action you want to perform to the database. The commands are in the form of SQL (Structured Query Language). DataAdapter :-A class that connects to the database system fetch the record and fill the dataset. It contains four different commands to perform database operations; Select Update Insert Delete. ex:- Login form using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Data.OleDb; namespace Login_Form_in_Csharp_Using_ProgressBar { public partial class Form1 : Form { string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings[dsn]; OleDbCommand com; OleDbDataAdapter oledbda; DataSet ds; string str; public Form1() { InitializeComponent(); } private void btnlogin_Click(object sender EventArgs e) { if (txtusername.Text ==  || txtpassword.Text == ) { MessageBox.Show(Please enter User ID or Password); txtusername.Text = ; txtpassword.Text = ; } else { OleDbConnection con = new OleDbConnection(ConnectionString); con.Open(); str = select count(*) from login where userid=' + txtusername.Text.Trim() + ' and password=' + txtpassword.Text.Trim() + '; com = new OleDbCommand(str con); oledbda = new OleDbDataAdapter(com); ds = new DataSet(); oledbda.Fill(ds login); long x; x = Convert.ToInt64(com.ExecuteScalar()); if (x == 1) { Form2 f1 = new Form2(); f1.Show(); this.Hide(); } else { MessageBox.Show(Invalid User ID or Password! Try Again!); txtusername.Text = ; txtpassword.Text = ; } con.Close(); } } } } Thanks If this post helps you mark it as answer