indexOfAuthorBegin0 = OldText.IndexOf("class=\"author\"");
OldText = OldText.Remove(0, indexOfAuthorBegin0);
indexOfAuthorBegin0 = OldText.IndexOf("class=\"author\"");
indexOfHref = OldText.IndexOf("href=");
difference = indexOfHref - (indexOfAuthorBegin0 + 15);
if (difference < 5 && difference >= 0)
{
indexOfClosingTag = OldText.IndexOf(">");
length = indexOfClosingTag - indexOfAuthorBegin0 - 14;
OldText = OldText.Remove(indexOfAuthorBegin0 + 15, length);
}
indexOfAuthorBegin = OldText.IndexOf("class=\"author\"") + 15;

indexOfAuthorEnd = OldText.IndexOf("<");
length = indexOfAuthorEnd - indexOfAuthorBegin;
if (length < 0)
{
break;
}

authorOfCitation = OldText.Substring(indexOfAuthorBegin, length);
OldText = OldText.Remove(0, indexOfAuthorEnd + 1);

//Literal1.Text = Literal1.Text + " " + i.ToString() + ". " + textOfCitation + " " + "(" + authorOfCitation + ")" + "</br>";
textOfCitation = cleanFromBr(textOfCitation);
textOfCitation = cleanFromQuot(textOfCitation);
citations[i - 1, 0] = textOfCitation;
citations[i - 1, 1] = authorOfCitation;

}

//Добавляем массив цитат в Excel
InsertToExcel();

//  движок для википедии
//{
//    string OldText, NewText, PossibleRefText, RefText;
//    strURL = TextBox1.Text;
//    OldText = GetHtmlFromUrl(strURL);
//    int begin;
//    int end;
//    int length;
//    int lastindex;
//    int newindex;
//    int indexofrefbegin, indexofspanbegin;
//    RefText = "<p class=\"data\">";
//    newindex = OldText.IndexOf(RefText);
//    begin = OldText.IndexOf(RefText);
//    lastindex = OldText.LastIndexOf("</p>");
//    while (!(newindex == (-1)))
//    {
//        begin = OldText.IndexOf(RefText) + 16;
//        end = OldText.IndexOf("</p>");
//        length = end - begin;
//        NewText = OldText.Substring(begin, length);
//        newindex = OldText.IndexOf(RefText);
//        Literal1.Text = Literal1.Text + NewText;
//    }
//}

private string cleanFromQuot(string text)
{
int indexOfStart, indexOfEnd;
indexOfStart = text.IndexOf("&quot;");
while (indexOfStart != -1)
{
indexOfEnd = indexOfStart + 6;
text = text.Remove(indexOfStart, 6);
text = text.Insert(indexOfStart, "\"");
indexOfStart = text.IndexOf("&quot;");
}
return text;
}

private void InsertToExcel()
{
Excel.Application oXL;
Excel._Workbook oWB;
Excel._Worksheet oSheet;
Excel.Range oRng;

try
{
//Start Excel and get Application object.
oXL = new Excel.Application();
oXL.Visible = true;

//Get a new workbook.
oWB = (Excel._Workbook)(oXL.Workbooks.Add(Missing.Value));
oSheet = (Excel._Worksheet)oWB.ActiveSheet;

//Add table headers going cell by cell.
//oSheet.Cells[1, 1] = "First Name";
//oSheet.Cells[1, 2] = "Last Name";
//oSheet.Cells[1, 3] = "Full Name";
//oSheet.Cells[1, 4] = "Salary";

//Format A1:D1 as bold, vertical alignment = center.
//oSheet.get_Range("A1", "D1").Font.Bold = true;
//oSheet.get_Range("A1", "D1").VerticalAlignment =
//    Excel.XlVAlign.xlVAlignCenter;

//Fill A1:B20 with an array of values (First and Last Names).
oSheet.get_Range("B1", "C20").Value2 = citations;

////Fill C2:C6 with a relative formula (=A2 & " " & B2).
//oRng = oSheet.get_Range("C2", "C6");
//oRng.Formula = "=A2 & \" \" & B2";

////Fill D2:D6 with a formula(=RAND()*100000) and apply format.
//oRng = oSheet.get_Range("D2", "D6");
//oRng.Formula = "=RAND()*100000";
//oRng.NumberFormat = "$0.00";

////AutoFit columns A:D.
//oRng = oSheet.get_Range("A1", "D1");
//oRng.EntireColumn.AutoFit();

//Manipulate a variable number of columns for Quarterly Sales Data.
//DisplayQuarterlySales(oSheet);

//Make sure Excel is visible and give the user control
//of Microsoft Excel's lifetime.
oXL.Visible = true;
oXL.UserControl = true;
}
catch (Exception theException)
{
String errorMessage;
errorMessage = "Error: ";
errorMessage = String.Concat(errorMessage, theException.Message);
errorMessage = String.Concat(errorMessage, " Line: ");
errorMessage = String.Concat(errorMessage, theException.Source);

//MessageBox.Show(errorMessage, "Error");
}
}

public enum ResponseCategories
{
Unknown = 0,       // Unknown code ( < 100 or > 599)
Informational = 1, // Informational codes (100 >= 199)
Success = 2,       // Success codes (200 >= 299)
Redirected = 3,    // Redirection code (300 >= 399)
ClientError = 4,   // Client error code (400 >= 499)
ServerError = 5    // Server error code (500 >= 599)
}

public static string GetHtmlFromUrl(string url)
{
if (string.IsNullOrEmpty(url))
throw new ArgumentNullException("url", "Parameter is null or empty");

string html = "";
HttpWebRequest request = GenerateHttpWebRequest(url);
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
if (VerifyResponse(response) == ResponseCategories.Success)
{
// Get the response stream.
Stream responseStream = response.GetResponseStream();
// Use a stream reader that understands UTF8.
using (StreamReader reader =
new StreamReader(responseStream, Encoding.UTF8))
{
html = reader.ReadToEnd();
}
}
}
return html;
}

public static HttpWebRequest GenerateHttpWebRequest(string UriString)
{
// Get a Uri object.
Uri Uri = new Uri(UriString);
// Create the initial request.
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(Uri);
// Return the request.
return httpRequest;
}

// POST overload
public static HttpWebRequest GenerateHttpWebRequest(string UriString,
string postData,
string contentType)
{
// Get a Uri object.
Uri Uri = new Uri(UriString);
// Create the initial request.
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(Uri);

// Get the bytes for the request; should be pre-escaped.
byte[] bytes = Encoding.UTF8.GetBytes(postData);

// Set the content type of the data being posted.
httpRequest.ContentType = contentType;
//"application/x-www-form-urlencoded"; for forms

// Set the content length of the string being posted.
httpRequest.ContentLength = postData.Length;

// Get the request stream and write the post data in.
using (Stream requestStream = httpRequest.GetRequestStream())
{
requestStream.Write(bytes, 0, bytes.Length);
}
// Return the request.
return httpRequest;
}