\n being a control code for new line.
alert("some
text\nmore text in a new line");
Thursday, 31 January 2013
Get duplicate items from a list using LINQ
List<String> duplicates =
lst.GroupBy(x => x)
.Where(g =>
g.Count() > 1)
.Select(g =>
g.Key)
.ToList();
Wednesday, 30 January 2013
Nested Datalist in asp.net
This article shows how to implement a nested DataList and also display category and subcategory using a nested DataList. You create two tables, one for category and another for subcategory and also create a stored procedure for selecting category and sub category from both tables in SQL Server. You have to create a web site and add a new page to the website. Drag and drop two DataList controls on the form, one is to bind category and the other is for subcategory. Let's take a look at a practical example. We create tables for category and subcategory.
Creating Table in SQL Server Database
Now create two tables named MajorCategory and MinorCategory. We create CategoryID in MajorCategory table that is the foreign key for the MinorCategory also set the identity property of the CategoryID. The table looks as below.
MajorCategory Table
MinorCategory Table
Creating a Stored Procedure
Now create a stored procedure to select data from both tables.
ALTER PROCEDURE [dbo].[usp_GetProductsForCategories]
AS
SELECT * FROM MajorCategory WHERE CategoryID IN
( SELECT CategoryID FROM MinorCategory )
SELECT p.MinorCategoryId , p.SubCategoryName ,p.CategoryID FROM MinorCategory p
First you have to create a web site.
- Go to Visual Studio 2010
- New-> Select a website application
- Click OK
Now add a new page to the website.
- Go to the Solution Explorer
- Right Click on the Project name
- Select add new item
- Add new web page and give it a name
- Click OK
Now create a new website and drag and drop two DataList controls onto the aspx page. TheDataList code looks like this.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="categorySubcategory.aspx.cs"
Inherits="categorySubcategory" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<ul>
<asp:DataList ID="outerDataList" runat="server"OnItemDataBound="outerRep_ItemDataBound">
<ItemTemplate>
<li>
<asp:Label Font-Size="Large" Font-Bold="true" ID="lblCategoryName"runat="server"
Text='<%# Eval("CategoryName") %>' />
</li>
<ul>
<asp:DataList ID="innerDataList" runat="server">
<ItemTemplate>
<li style="background-color:AliceBlue">
<asp:HyperLink ID="hlProductName" runat="server" Text='<%#Eval("SubCategoryName")%>' />
</li>
</ItemTemplate>
</asp:DataList>
</ul>
</ItemTemplate>
</asp:DataList>
</ul>
</div>
</form>
</body>
</html>
Now add the following namespaces.
using System.Data.SqlClient;
using System.Data;
Now write the connection string to connect to the database.
string strConnection = "Data Source=.; uid=sa; pwd=wintellect;database=registration;";
Now double-click on the page and write the following code for binding the data with the DataList.
private void BindData()
{
SqlConnection myConnection = new SqlConnection("Data Source=.; uid=sa; pwd=wintellect;database=registration;");
SqlCommand myCommand = new SqlCommand("usp_GetProductsForCategories", myConnection);
myCommand.CommandType = CommandType.StoredProcedure;
SqlDataAdapter ad = new SqlDataAdapter(myCommand);
DataSet ds = new DataSet();
ad.Fill(ds);
// Attach the relationship to the dataSet
ds.Relations.Add(new DataRelation("CategoriesRelation", ds.Tables[0].Columns["CategoryID"],
ds.Tables[1].Columns["CategoryID"]));
outerDataList.DataSource = ds.Tables[0];
outerDataList.DataBind();
}
Now write the below code on the OnItemDataBound event of the DataList.
protected void outerRep_ItemDataBound(object sender, DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item)
{
DataRowView drv = e.Item.DataItem as DataRowView;
DataList innerDataList = e.Item.FindControl("innerDataList") as DataList;
innerDataList.DataSource = drv.CreateChildView("CategoriesRelation");
innerDataList.DataBind();
}
}
Codebehind
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
public partial class categorySubcategory : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
BindData();
}
private void BindData()
{
SqlConnection myConnection = new SqlConnection("Data Source=.; uid=sa; pwd=wintellect;database=registration;");
SqlCommand myCommand = new SqlCommand("usp_GetProductsForCategories", myConnection);
myCommand.CommandType = CommandType.StoredProcedure;
SqlDataAdapter ad = new SqlDataAdapter(myCommand);
DataSet ds = new DataSet();
ad.Fill(ds);
// Attach the relationship to the dataSet
ds.Relations.Add(new DataRelation("CategoriesRelation", ds.Tables[0].Columns["CategoryID"],
ds.Tables[1].Columns["CategoryID"]));
outerDataList.DataSource = ds.Tables[0];
outerDataList.DataBind();
}
protected void outerRep_ItemDataBound(object sender, DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item)
{
DataRowView drv = e.Item.DataItem as DataRowView;
DataList innerDataList = e.Item.FindControl("innerDataList") as DataList;
innerDataList.DataSource = drv.CreateChildView("CategoriesRelation");
innerDataList.DataBind();
}
}
}
Now run the application and test it.
The above output displays subcategory according to the category.
Reference :
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Tuesday, 29 January 2013
sql concatenate string group by
Concatenate many rows into a single text string:
CREATE TABLE
#YourTable ([ID] INT, [Name] CHAR(1), [Value] INT)
INSERT INTO
#YourTable ([ID],[Name],[Value]) VALUES (1,'A',4)
INSERT INTO
#YourTable ([ID],[Name],[Value]) VALUES (1,'B',8)
INSERT INTO
#YourTable ([ID],[Name],[Value]) VALUES (2,'C',9)
SELECT
[ID],
STUFF((
SELECT ', ' + [Name] + ':' + CAST([Value] AS VARCHAR(MAX))
FROM #YourTable
WHERE (ID = Results.ID)
FOR XML PATH (''))
,1,2,'') AS NameValues
FROM #YourTable Results
GROUP BY ID
DROP TABLE #YourTable
Turn textbox into label
1.
Change the readonly property of textbox to TRUE
2. Change
the back color of textbox to transparent.
3. Change
the border of the text box to none.
This will feel TextBox as a Label
Friday, 25 January 2013
Create Linked Server SQL Server 2008
Creating a linked server in SQL Server 2008 is a great way to
run CRUD statements against a completely different remote server. This method
relies on Windows Authentication.
This is only one way to do it.
There are others. And, if you are going to run SQL statements against a linked
server from a web app, you need to have the permissions set up properly. From
the article “How do I… Query foreign data using SQL Server’s linked
servers?” by Susan Harkins:
The biggest catch to all this simplicity is, as always, security. If you’re working with Windows Authentication, the system accommodates well. If the user has the appropriate permissions for the servers and data sources, linked queries will work.
If you have users outside the Windows Authentication
environment, you can use a linked login. Create a standard login and assign the
appropriate permissions on the remote server.
Setting It Up
1.
Go to “Server Objects” of the database server where the linked
server will be added and right click on “Linked Servers”. Select “Add New Linked
Server”.
2.
In the “General” tab, add a name for the new linked server in
the “Linked Server” field.
3.
Select “Other data source”and for “Provider” select “Microsoft
OLE DB for SQL Server”
4.
For “Product Name” type in “SQLOLEDB”
5.
In the “Data Source” field, enter the IP address of the server
to be linked
6.
“Catalog” is the name of the database on the linked server and
is optional
7.
Go to the “Security” tab and select “Be made using this security
context”. Type in the remote login and credentials
Running Queries
To query against this server user the syntax:
SELECT * FROM [MY_LINKED_SERVER].[database_name].[dbo].[table_name]
|
Or, for a join, use linked table with an alias (example):
SELECT * FROM Table
|
|
RIGHT OUTER JOIN
|
|
[MY_LINKED_SERVER].[database_name].[dbo].[table_name]
LinkedTable
|
|
ON Table.column = LinkedTable.column
|
|
Reference:
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