Create Xml File and Append the Existing Xml file

Using System.Xml;
Make one Cofiguration Folder Inside make that .xml file.

protected void btnGeneratexmlfile_Click(object sender, EventArgs e)
{
string type = "new";
Int32 queryid;
string FilePath = Request.PhysicalApplicationPath + @"Configuration\" + "QueryMaster.xml";
string SouPath = Request.PhysicalApplicationPath + "Configuration";
StringBuilder _UserInfo = new StringBuilder();

if (File.Exists(FilePath) == true)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load (FilePath);
XmlNode xmlNode = xmlDoc.SelectSingleNode("//querytrans");
if (type == "new")
queryid = 1000 + xmlNode.ChildNodes.Count + 1;
String Query = "trans type=\"new\" bookid=\"1\" assetid=\"35\" queryid=\"6\" byuserid=\"5\" byroleid=\"1\" touserid=\"4\" toroleid=\"9\" transdate=\"" + DateTime.Now.ToString() + "\"> ![CDATA[" + 12 + "]]> /trans>";
xmlNode.InnerXml = xmlNode.InnerXml + Query;

File.SetAttributes(FilePath, FileAttributes.Normal);
xmlDoc.Save(FilePath);//Append the xml file

}
else//if file not exist
{
_UserInfo.Append("?xml version=\"1.0\" encoding=\"utf-8\" ?>");
_UserInfo.Append("querytrans>");
_UserInfo.Append("/querytrans>");
StreamWriter _sw = new StreamWriter(SouPath + "\\QueryMaster.xml");
_sw.WriteLine(_UserInfo.ToString());
_sw.Flush();
_sw.Close();
_sw.Dispose();

}
}

HTML Report in c# .Net

//Blog does not take starting tag of the html.....please write all starting tag and end tag before each table tag,th tag and tr tag and td tag and closing tag...


protected void btnHtmlkReport_Click(object sender, EventArgs e)
{
conn.open();
SqlCommand cmd = new SqlCommand("select * from students", conn);
SqlDataReader oDr = cmd.ExecuteReader();
if (oDr.HasRows)
{
StringBuilder sb = new StringBuilder();
sb.Append("table align='center'>");
sb.Append("tr> td > th>Financial Report /th>/td>/tr>");
sb.Append("tr>td align='center'>");
sb.Append("id".ToString());
sb.Append("/td>");
sb.Append("td align='center'>");
sb.Append("Name".ToString());
sb.Append("/td>");
sb.Append("td align='center'>");
sb.Append("Roll".ToString());
// finish the rest of the row
sb.Append("");
// get your data
while (oDr.Read())
{
sb.Append("tr>td align='center'>");
sb.Append(oDr["id"].ToString());
sb.Append("/td>");
sb.Append("td align='center'>");
sb.Append(oDr["Name"].ToString());
sb.Append("/td>");
sb.Append("td align='center'>");
sb.Append(oDr["Roll"].ToString());
// finish the rest of the row
sb.Append("/td>/tr>");
}
sb.Append("/table>");
Response.Write(sb);
con.close();
}
}

Registered .DLL

Manual Registration
You can register a DLL manually. To do this, follow these steps:

1. Find the exact location of your .dll file.

2. Click on the Start menu.

3. Select the Run option.

4. On the edit field of the Run dialog box, type regsvr32 followed by the complete path and file name of the .dll file. The path and file name should be enclosed in quotation marks.

Here is an example:

regsvr32 “C:\Windows\System32\abd.dll”

5. Make sure you have typed the information correctly and press enter. The system will include the .dll file in the registry.

6. You will see a message box telling you the DLL file has been successfully registered.

Create and Close Connection using singleton in c#

//Class

public class GetConnection
{
private static SqlConnection connection = null;
public static SqlConnection conn
{
get {
if (connection == null)
{
connection = new SqlConnection(ConfigurationManager.ConnectionStrings["SchoolsConnectionString"].ConnectionString);
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Closed)
{
connection.Open();
}

return connection;
}
}

public static void closeconn(SqlConnection connection)
{
if (connection.State == System.Data.ConnectionState.Open)
{
connection.Close();
}

}

}

//aspx.cs Button click use Singleton Class

SqlCommand cmd = new SqlCommand("select * from students", GetConnection.conn);
SqlDataAdapter adp = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
adp.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
SqlCommand cmd1 = new SqlCommand("insert into student(Name) values(s)", GetConnection.conn);
cmd.ExecuteNonQuery();
GetConnection.closeconn(GetConnection.conn);

Update Existing Xml file

//Xml File

?xml version="1.0" encoding="utf-8"?>
CategoryList>
Category ID="01">
MainCategory>XML /MainCategory>
Description>This is a list my XML articles. /Description>
Active>true /Active>
/Category>
Category ID="02">
MainCategory>Asp.net /MainCategory>
Description>Subahsh /Description>
Active>True /Active>
/Category>
/CategoryList>


//aspx.cs

if (!IsPostBack)
{
XmlDocument xml = new XmlDocument();
string s = Server.MapPath("XMLfILE.xml");
string list = "/CategoryList/Category";
xml.Load(s);
XmlNodeList xn = xml.SelectNodes(list);
foreach (XmlNode eleSourceNode in xn)
{
string ID = eleSourceNode.Attributes["ID"].Value;
string author1 = eleSourceNode["MainCategory"].InnerText;
DropDownList1.Items.Add(new ListItem(author1, ID));
}


}

//DropDown SelectIndexChange

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(Server.MapPath("XMLfILE.xml"));

XmlNodeList nodeList = xmlDoc.SelectNodes("/CategoryList/Category[@ID='"+DropDownList1.SelectedValue+"' ]");

TextBox2.Text = nodeList[0].ChildNodes[0].InnerText;
TextBox3.Text= nodeList[0].ChildNodes[1].InnerText;
TextBox4.Text = nodeList[0].ChildNodes[2].InnerText;

}

//Update Xml File

protected void btnUpdateXml_Click(object sender, EventArgs e)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(Server.MapPath("XMLfILE.xml"));

XmlNodeList nodeList = xmlDoc.SelectNodes("/CategoryList/Category[@ID='" + DropDownList1.SelectedValue + "' ]");

// update MainCategory
nodeList[0].ChildNodes[0].InnerText = TextBox2.Text.Trim();
// update Description
nodeList[0].ChildNodes[1].InnerText = TextBox3.Text.Trim();
// update Active
nodeList[0].ChildNodes[2].InnerText = TextBox4.Text.Trim();

// Don't forget to save the file
xmlDoc.Save(Server.MapPath("XMLfILE.xml"));
}

Take zip folder and Unzip the file using Ionic Zip Dll

//using Ionic.Zip;

//take one file upload control and click event write

if (FileUpload1.HasFile)
{

String TargetDirectory = FileUpload1.PostedFile.FileName;
using (Ionic.Zip.ZipFile zip1 = Ionic.Zip.ZipFile.Read(TargetDirectory))
{
zip1.ExtractAll(Server.MapPath("UploadFile")
, Ionic.Zip.ExtractExistingFileAction.OverwriteSilently);
}
}

Singleton Example

//Class , Only one instance is created of Singleton class.
public class Singleton
{
public int x=0;
private static Singleton Instance;
private Singleton() { }
public static Singleton instance
{
get
{
if (Instance == null)
{
Instance = new Singleton();
}
return Instance;
}
}
}

//Page Load Check for Instance
Singleton s = Singleton.instance;
Singleton s1 = Singleton.instance;