ASP.NET concepts in short

1.Add two number and display in a detail page

 Label3.Text =(Convert.ToInt32(TextBox2.Text) + Convert.ToInt32(TextBox3.Text)).ToString();

2.Click on a link and navigate to different page

 Server.Transfer("Contact.aspx");

 Response.Redirect("Contact.aspx");

4.Reusable component concept

Usercontrol

pass data from parent to child

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parent

------

Label3.Text =(Convert.ToInt32(TextBox2.Text) + Convert.ToInt32(TextBox3.Text)).ToString();

WebUserControl11.labels = Label3.Text;

child

-----

public dynamic labels

{

 get { return Label1.Text; }

 set { Label1.Text = value; }

}

pass data from child to parent

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child

-----

public delegate void WebUserControl1Delegate(dynamic a);

public  event  WebUserControl1Delegate s;

protected void Button1_Click(object sender, EventArgs e)

{

 s(1);

}

parent

------

protected void Page_Load(object sender, EventArgs e)

{

  WebUserControl11.s += new WebUserControl1.WebUserControl1Delegate(a);

}

void a(dynamic a)

{

// 1 will get passed

}

3.State mangement

  -cookie

  -session

  -localstorage

  -sessionstorage

  -query string

Label1

WebUserControl11.Label1

-------

cookie

-------

Set

HttpContext.Response.Cookies.Append("user_id", "1");

Get

var userId = HttpContext.Request.Cookies["user_id"];

In order to add expiry time

---------------------------

using Microsoft.AspNetCore.Http;

CookieOptions cookieOptions = new CookieOptions();            

HttpContext.Response.Cookies.Append("first_request", DateTime.Now.ToString(), cookieOptions);

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session

-------

var products=Db.GetProducts();

Session["products"]=products //set

var products=Session["products"] as List<Product>; //get

Session["products"]=null; /clear

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localstorage 

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In order to access in cs code

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string script = string.Format("sessionStorage.userId= '{0}';", "12345");

ClientScript.RegisterClientScriptBlock(this.GetType(), "key", script, true)

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Query string

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/nextpage.aspx?name=Jenna Doe

Response.Redirect(“nextpage.aspx?name=Jenna Doe”);

var name=HttpContext.Request.Query["name"];