Data Base Handling [Using Code]

-

 using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls; 

using System.Data.SqlClient;


public partial class Registration : System.Web.UI.Page

{

    SqlConnection cn;

    SqlCommand cm;

    SqlDataReader dr;


    protected void Page_Load(object sender, EventArgs e)

    {


    }


    protected void Button1_Click(object sender, EventArgs e)

    {   //step 1- connection to database

        string path =@"Data Source=49.50.88.43;Initial Catalog=grkistdb;Persist Security Info=True;User ID=grkistuser;Password=q2oR5w_356";

        cn = new SqlConnection(path);

        cn.Open();


        //step 2- Command (write a query) 

        string q = "insert into Chitransh_stu values('" + TextBox1.Text + "' , '" + TextBox2.Text + "' , '" + TextBox3.Text + "' , '" + TextBox4.Text + "' , '" + TextBox5.Text + "' , '" + TextBox6.Text + "')";

        cm = new SqlCommand(q, cn); 


        //step 3- execute the query

        cm.ExecuteNonQuery();

        TextBox1.Text = "";

        TextBox2.Text = "";

        TextBox3.Text = "";

        TextBox4.Text = "";

        TextBox5.Text = "";

        TextBox6.Text = "";

    }

}

How to connect to data base- 

step 1- 

Include SqlClient library to your project .

With the help of using keyword ,at the top of the page. 

i.e- using System.Data.SqlClient; 

step 2- 

Create objects for connection, command and data reading. 

Objects are always created before the Page_load event. 

>SqlConnection cn;

>SqlCommand cm; 

>SqlDatareader dr;


Note:- In OOPs , Firstly the information (database path, Query)  stored in a variable and pass to an object.  

The operation can be performed in 3 steps:- 

Step1 - Connection to database

string s =@"path";

[here the path will be stored in a variable s , @ symbol is used to identify the path no spaces between = and @]

cn = new SqlConnection(s); 

[here cn is the object of SqlConnection , the variable in which the path is stored will get passed into the object in the parameter] 

cn.open(); 

[To open the database]

Step2 - Command 

string q= "Query"; 

cm = new SqlCommand(q,cn);  

SqlCommand holds two parameters first for the variable and second for the connection. 

Step3 - Execute the query 

cm.ExecuteNonQuery(); 

[here we use insertion operation so insertion operation comes under ExecuteNonQuery ]














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