Useful Techniques in Asp.Net

1. Finding the particular Data from the Dataset,Its Row Position and Current Page in Grid
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DataSet dsQuoteList = objQuote.GetQuoteBankList();

Giving a constraints to the first column that is the ID primary key like:

dsQuoteList.Tables[0].Constraints.Add("pk", dsQuoteList.Tables[0].Columns[0], true);

Now,

The below code will find the perticular ID int the given dataset and return new Datarow..

DataRow dr = dsQuoteList.Tables[0].Rows.Find("10540");

Now finding the Row position (RowIndex) in the Dataset, like..:

int RowIndx = int.Parse(dsQuoteList.Tables[0].Rows.IndexOf(dr).ToString()

Finally, You will get the exact position of particular Data in the Dataset.

In Addition You can also find the Current Page in the Datagrid or GridView after getting Datarow:

int PageSize = 10;

double CurrPage = Math.Ceiling(Convert.ToDouble(int.Parse(dsQuoteList.Tables[0].Rows.IndexOf(dr).ToString()) / PageSize ));

Done..

That's it !

2. Find the Exact words from string
==================================

using System.Text;
using System.Text.RegularExpressions;

Write in the Button Click Event :

private void button1_click(object sender, EventArgs e)
{
string strInput = "Hello World I am Here with the new sunrise";
string strOutput = FindFirstWords(strInput, 4);

// Here the result of strOutput variable is : Hello World I am
}

Function to get the Words from string:

private string FindFirstWords(string input, int HowManyFind)
{
string REGEX = @"([\w]+\s+){" + HowManyFind + "}";

StringBuilder output = new StringBuilder();

foreach (Capture capture in Regex.Match(input, REGEX).Captures)
{
output.Append(capture.Value);
}
return output.ToString();
}

3. foreach loop in Enum
==================================

objDataImport = new DataImport();
foreach (string s in Enum.GetNames(typeof(DataImport.eTotalFeature)))
{
objDataImport.CurrentFeature = (DataImport.eTotalFeature)Enum.Parse(typeof(DataImport.eTotalFeature), s);
objDataImport.FetchContent();
}

4. Read line by line from text file in C#
==========================================

string strFile = @"C:\Files\new.txt";

StreamReader objStreamReader = File.OpenText(strFile);

string strGetLine;
while ((strGetLine = objStreamReader.ReadLine()) != null)
{
Response.Write(strGetLine);
}

How to download any file with Asp.Net
=================================

string FileName = Server.MapPath("style.css").ToString();

Response.Clear();
Response.ClearContent();
Response.ContentType = "text/plain";
Response.AddHeader("Content-Disposition", "attachment; filename=Name.css;");

byte[] buffer = System.IO.File.ReadAllBytes(FileName);

System.IO.MemoryStream mem = new System.IO.MemoryStream();
mem.Write(buffer, 0, buffer.Length);

mem.WriteTo(Response.OutputStream);
Response.End();


Render GridView to Html String
==========================

In many times I have faced a problem when you want to
render html string for GridView Control, but you
probably find error like...

"Control '<GridViewID>' of type 'GridView' must be placed inside a form tag with runat=server."

In this case you have to use one method to avoid this error..

public override void VerifyRenderingInServerForm(Control control)
{
// Confirms that an HtmlForm control is rendered for the
// specified ASP.NET server control at run time.

// No code required here.
}

and in the page directives just add this code marked in Bold Text..

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="CompanyList.aspx.cs" Inherits="CompanyList" EnableEventValidation="false" %>

That's it !
Hope you will like it.