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SGML formating Issue

I have an requirement to read the SGML file and replace if the symbol like comma(,) or full stop (.) then I need to change the symbols and save with the same SGML file itself but I am facing the format issue after replacing the content.
Below is my code and my final output would be store with the same .sgm format.
The below code is working but after replacing the values the output format is differs. Can you suggest for this scenario
Main method:
string resultValue = HTMLToEntity(ReplaceSGML(sbContent.ToString()));
StringReader sr = new StringReader(resultValue.ToString());
SgmlReader reader = new SgmlReader();
reader.WhitespaceHandling = WhitespaceHandling.All;
reader.CaseFolding = Sgml.CaseFolding.ToLower;
reader.InputStream = sr;
StringWriter sw = new StringWriter();
XmlTextWriter w = new XmlTextWriter(sw);
w.Formatting = System.Xml.Formatting.Indented;
w.WriteStartDocument();
reader.Read();
while (!reader.EOF)
{
w.WriteNode(reader, true);
}
//File.WriteAllText(#"C:\Output\test.sgm", );
w.Flush();
w.Close();
Method : ReplaceSGML
private static string ReplaceSGML(string html)
{
XmlDocument xml = new XmlDocument();
xml.Load(_xmlEnglishPath);
XmlNodeList resources = xml.SelectNodes("root/data");
_htmlEnglishDictonaries = new Dictionary<string, string>();
_htmlEnglishDictonaries.Add(";", "{After1Space}"); // replacing semicolon into {After1space}
_htmlEnglishDictonaries.Add(":", "{Before1Space}"); // replacing colon into {Before1Space}
_htmlEnglishDictonaries.Add(".", "{Before1Space}"); // replacing . into {Before1Space}
string line = string.Empty;
StringReader reader = new StringReader(html);
while (reader.Peek() > -1)
{
line = reader.ReadLine();
foreach (var events in _htmlEnglishDictonaries)
{
if (line.Contains(events.Key))
{
// Rule should be implement
// <!-- Replacetext 1.{After1Space}, 2.{Before1Space}, 3.{NoSpace}, 4. {After1LetterCaps} -->
int idx;
if (events.Value.ToLower().Trim() == "{after1space}")
{
idx = line.IndexOf(events.Key) + events.Key.Length;
if (line[idx].ToString() != " ")
{
line = line.Replace(events.Key, events.Key + " ");
}
}
if (events.Value.ToLower().Trim() == "{before1space}")
{
idx = line.IndexOf(events.Key);
if (line[idx].ToString() != " ")
{
line = line.Replace(events.Key, " " + events.Key);
}
}
if (events.Value.ToLower().Trim() == "{before1space},{after1space}")
{
idx = line.IndexOf(events.Key);
if (line[idx].ToString() != " ")
{
line = line.Replace(events.Key, " " + events.Key + " ");
}
}
if (events.Value.ToLower().Trim() == "{nospace}")
{
idx = line.IndexOf(events.Key);
if (line[idx].ToString() != " ")
{
line = line.Replace(events.Key, " " + events.Key);
}
}
if (events.Value.ToLower().Trim() == "{after1lettercaps}")
{
idx = line.IndexOf(events.Key) + events.Key.Length;
if (line[idx].ToString() != " ")
{
if (line[idx + 1].ToString() != " ")
{
line = line.Replace(events.Key, " " + events.Key + line[idx + 1].ToString().ToUpper());
}
else
{
line = line.Replace(events.Key, " " + events.Key);
}
}
}
}
}
}
return line.ToString();
}
Thanks in advance

Automatically create folders if does not exists in C#

So, I am trying to create a file at a specific path but the code I have doesn't allows me to create folders.
This is the code I have:
public void LogFiles()
{
string data = string.Format("LogCarga-{0:yyyy-MM-dd_hh-mm-ss}.txt", DateTime.Now);
for (int linhas = 0; linhas < dataGridView1.Rows.Count; linhas++)
{
if (dataGridView1.Rows[linhas].Cells[8].Value.ToString().Trim() != "M")
{
var pathWithEnv = #"%USERPROFILE%\AppData\Local\Cargas - Amostras\_logs\";
var filePath = Environment.ExpandEnvironmentVariables(pathWithEnv);
using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate))
{
using (StreamWriter writer = File.AppendText(filePath + data))
{
string carga = dataGridView1.Rows[linhas].Cells[0].Value.ToString();
string referencia = dataGridView1.Rows[linhas].Cells[1].Value.ToString();
string quantidade = dataGridView1.Rows[linhas].Cells[2].Value.ToString();
string dataemissao = dataGridView1.Rows[linhas].Cells[3].Value.ToString();
string linha = dataGridView1.Rows[linhas].Cells[4].Value.ToString();
string marca = dataGridView1.Rows[linhas].Cells[5].Value.ToString().Trim();
string descricaoweb = dataGridView1.Rows[linhas].Cells[6].Value.ToString().Trim();
string codprod = dataGridView1.Rows[linhas].Cells[7].Value.ToString().Trim();
string tipoemb = dataGridView1.Rows[linhas].Cells[8].Value.ToString().Trim();
string nomepc = System.Environment.MachineName;
writer.WriteLine(carga + ", " + referencia + ", " + quantidade + ", " + dataemissao + ", " + linha + ", " + marca + ", " + descricaoweb + ", " + codprod + ", "
+ tipoemb + ", " + nomepc);
}
}
}
}
}
This %USERPROFILE%\AppData\Local\ in the universal path and I want to automatically create the \Cargas - Amostras\_logs\.
Do you have any idea how to do it?

The simpelest solution is replace
using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate))
with
System.IO.Directory.CreateDirectory(filePath)
That will create the directory if it does not exist or do nothing if it does.

You need to create two checks, for your first folder and then second directory.
var pathWithEnv = #"%USERPROFILE%\AppData\Local\Cargas - Amostras\";
if (System.IO.Directory.Exists(pathWithEnv))
{
pathWithEnv = System.IO.Path.Combine(pathWithEnv, #"_logs\");
if (System.IO.Directory.Exists(pathWithEnv))
{
//Do what you want to do, both directories are found.
}
else
{
System.IO.Directory.CreateDirectory(pathWithEnv);
//Do what you want to do, both directories are available.
}
}
else
{
System.IO.Directory.CreateDirectory(pathWithEnv);
pathWithEnv = System.IO.Path.Combine(pathWithEnv, #"_logs\");
if (System.IO.Directory.Exists(pathWithEnv))
{
//Do what you want to do, both directories are available now.
}
else
{
System.IO.Directory.CreateDirectory(pathWithEnv);
//Do what you want to do, both directories are created.
}
}

Reading txt files using task concept working slow

my requirement was reading some 300 text files each of around 40-70 MB line by line to perform some kind of checks . As the files are huge so I thought of using TPL concept i.e. tasks. if I am not using task concept, it is taking around 7 minutes but if I am doing it by using task , it is taking long time don't know why. I will be so thankful if someone please review my code and tell me where I am doing wrong in using task. Any help would be appreciated. Below is my code :
private void browse_Click(object sender, EventArgs e)
{
try
{
string newFileName1 = "";
string newFileName2 = "";
week = textBox2.Text;
if (week == null || week == "")
{
MessageBox.Show("Week cannot be null.");
return;
}
DialogResult result = folderBrowserDialog1.ShowDialog();
if (result == DialogResult.OK)
{
DateTime starttime = DateTime.Now;
string folderPath = Path.GetDirectoryName(folderBrowserDialog1.SelectedPath);
string folderName = Path.GetFileName(folderPath);
DirectoryInfo dInfo = new DirectoryInfo(folderPath);
foreach (DirectoryInfo folder in dInfo.GetDirectories())
{
newFileName1 = "Files_with_dates_mismatching_the_respective_week_" + folder.Name + ".txt";
newFileName2 = "Files_with_wrong_date_format_" + folder.Name + ".txt";
if (File.Exists(folderPath + "/" + newFileName1))
{
File.Delete(folderPath + "/" + newFileName1);
}
if (File.Exists(folderPath + "/" + newFileName2))
{
File.Delete(folderPath + "/" + newFileName2);
}
FileInfo[] folderFiles = folder.GetFiles();
if (folderFiles.Length != 0)
{
List<Task> tasks = new List<Task>();
foreach (var file in folderFiles)
{
var task = Task.Factory.StartNew(() =>
{
bool taskResult = ReadFile(file.FullName, folderPath, folderName, week);
return taskResult;
});
tasks.Add(task);
}
Task.WaitAll(tasks.ToArray());
DateTime stoptime = DateTime.Now;
TimeSpan totaltime = stoptime.Subtract(starttime);
label6.Text = Convert.ToString(totaltime);
textBox1.Text = folderPath;
DialogResult result2 = MessageBox.Show("Read the files successfully.", "Important message", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
}
catch (Exception)
{
throw;
}
}
public bool ReadFile(string file, string folderPath, string folderName, string week)
{
int LineCount = 0;
string fileName = Path.GetFileNameWithoutExtension(file);
using (FileStream fs = File.Open(file, FileMode.Open))
using (BufferedStream bs = new BufferedStream(fs))
using (StreamReader sr = new StreamReader(bs))
{
for (int i = 0; i < 2; i++)
{
sr.ReadLine();
}
string oline;
while ((oline = sr.ReadLine()) != null)
{
LineCount = ++LineCount;
string[] eachLine = oline.Split(';');
string date = eachLine[30].Substring(1).Substring(0, 10);
DateTime dt;
bool valid = DateTime.TryParseExact(date, "dd/MM/yyyy", CultureInfo.InvariantCulture, DateTimeStyles.None, out dt);
if (!valid)
{
Filecount = ++Filecount;
StreamWriter sw = new StreamWriter(folderPath + "/" + "Files_with_wrong_date_format_" + folderName + ".txt", true);
sw.WriteLine(fileName + " " + "--" + " " + "Line number :" + " " + LineCount);
sw.Close();
}
else
{
DateTime Date = DateTime.ParseExact(date, "d/M/yyyy", CultureInfo.InvariantCulture);
int calculatedWeek = new GregorianCalendar(GregorianCalendarTypes.Localized).GetWeekOfYear(Date, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Saturday);
if (calculatedWeek == Convert.ToInt32(week))
{
}
else
{
Filecount = ++Filecount;
StreamWriter sw = new StreamWriter(folderPath + "/" + "Files_with_dates_mismatching_the_respective_week_" + folderName + ".txt", true);
sw.WriteLine(fileName + " " + "--" + " " + "Line number :" + " " + LineCount);
sw.Close();
}
}
}
}
return true;
}

Since you are using Task.WaitAll(tasks.ToArray()). Wait will synchronously block until the task completes. But can you try with await (Not in TPL), await will asynchronously wait until the task completes

Folder Watch when File is Created

im writing a code in C# that watches a folder and when a file gets created the code makes some actions and writes the results to a log file.
im having this very strange behaviour. when i file gets created in the watched folder the function that handles the change is executed twise! even if it is only one change event.
initially i used FileSystemWatcher. but i after looking it up, i saw that it has meny stability issued so i switched to MyFileSystemWatcher which is a much more stable impliminatation. but im still getting duplications in my log file. i have no idea why the code that is in chanrge for looking up the change runs twise. here is the code sample
protected void Folder_Watch(string path)
{
if (!Directory.Exists(path))
{
try
{
System.IO.Directory.CreateDirectory(path);
}
catch (Exception ex)
{
File.AppendAllText(logPath + "\\SSHErrorLog.log", "[]*******" + DateTime.Now + " Error: " + ex.Message.ToString() + Environment.NewLine);
}
}
MyFileSystemWatcher m_Watcher = new MyFileSystemWatcher(path);
//m_Watcher.Path = path;
m_Watcher.Filter = "*.*";
m_Watcher.NotifyFilter = NotifyFilters.FileName;
m_Watcher.Created += new FileSystemEventHandler(OnChanged);
m_Watcher.EnableRaisingEvents = true;
}
here is the onChange function
private void OnChanged(object source, FileSystemEventArgs e)
{
File.AppendAllText(logPath + "\\SSHConnectionLog.log", "[]*******" + DateTime.Now + " OnChanged function: " + Environment.NewLine);
// Decrypt the file.
DecryptFile(keyPath + "\\id_rsa_Encrypted", keyPath + "\\id_rsa", sSecretKey);
// Remove the Key from memory.
//PKey = new PrivateKeyFile(keyPath + "\\id_rsa");
keyResult.Text = "RSA keys Were Generated at:" + keyPath;
//ScpClient client = new ScpClient("remnux", "adi", PKey);
Chilkat.SFtp client = new Chilkat.SFtp();
string[] tempPath = e.FullPath.Split('\\');
string fullPathNew = string.Empty;
for (int i = 0; i < tempPath.Length - 1; i++)
{
fullPathNew += tempPath[i];
}
if (Directory.Exists(fullPathNew))
{
sshConnect(client);
File_Upload(e.FullPath, client);
}
else
{
try
{
sshConnect(client);
System.IO.Directory.CreateDirectory(fullPathNew);
File_Upload(e.FullPath, client);
}
catch (Exception ex)
{
File.AppendAllText(logPath + "\\SSHErrorLog.log", "[]*******" + DateTime.Now + " Error in OnChanged function: " + ex.Message.ToString() + Environment.NewLine);
}
}
}
any help would be very much appriciated!

handled the onChange function. added time and file name to handle duplicate hits
private void OnChanged(object source, FileSystemEventArgs e)
{
string[] temp = new string[3];
string[] tempNow = new string[3];
string[] tempSeconds = new string[2];
string[] tempNowSeconds = new string[2];
int temp1 = 0;
int temp2 = 0;
if(string.IsNullOrEmpty(changeName))
{
changeName = e.Name;
}
if (string.IsNullOrEmpty(changeTime))
{
changeTime = DateTime.Now.ToString();
temp = this.changeTime.Split(':');
tempNow = DateTime.Now.ToString().Split(':');
tempSeconds = temp[2].Split(' ');
tempNowSeconds = temp[2].Split(' ');
temp1 = Convert.ToInt16(tempSeconds[0]);
temp2 = Convert.ToInt16(tempNowSeconds[0]);
// Decrypt the file.
DecryptFile(keyPath + "\\id_rsa_Encrypted", keyPath + "\\id_rsa", sSecretKey);
// Remove the Key from memory.
PKey = new PrivateKeyFile(keyPath + "\\id_rsa");
keyResult.Text = "RSA keys Were Generated at:" + keyPath;
ScpClient client = new ScpClient("remnux", "adi", PKey);
string[] tempPath = e.FullPath.Split('\\');
string fullPathNew = string.Empty;
for (int i = 0; i < tempPath.Length - 1; i++)
{
fullPathNew += tempPath[i];
}
if (Directory.Exists(fullPathNew))
{
sshConnect(client);
File_Upload(e.FullPath, client);
}
else
{
try
{
sshConnect(client);
System.IO.Directory.CreateDirectory(fullPathNew);
File_Upload(e.FullPath, client);
}
catch (Exception ex)
{
File.AppendAllText(logPath + "\\SSHErrorLog.log", "[]*******" + DateTime.Now + " Error in OnChanged function: " + ex.Message.ToString() + Environment.NewLine);
}
}
}
if (!this.changeTime.Equals(DateTime.Now.ToString()))
{
temp = this.changeTime.Split(':');
tempNow = DateTime.Now.ToString().Split(':');
tempSeconds = temp[2].Split(' ');
tempNowSeconds = temp[2].Split(' ');
temp1 = Convert.ToInt16(tempSeconds[0]);
temp2 = Convert.ToInt16(tempNowSeconds[0]);
if (temp[2] != tempNow[2])
{
if ((temp1 < temp2 + 10 || temp1 > temp2 +40) && e.Name != changeName)
{
// Decrypt the file.
DecryptFile(keyPath + "\\id_rsa_Encrypted", keyPath + "\\id_rsa", sSecretKey);
// Remove the Key from memory.
PKey = new PrivateKeyFile(keyPath + "\\id_rsa");
keyResult.Text = "RSA keys Were Generated at:" + keyPath;
ScpClient client = new ScpClient("remnux", "adi", PKey);
string[] tempPath = e.FullPath.Split('\\');
string fullPathNew = string.Empty;
for (int i = 0; i < tempPath.Length - 1; i++)
{
fullPathNew += tempPath[i];
}
if (Directory.Exists(fullPathNew))
{
sshConnect(client);
File_Upload(e.FullPath, client);
}
else
{
try
{
sshConnect(client);
System.IO.Directory.CreateDirectory(fullPathNew);
File_Upload(e.FullPath, client);
}
catch (Exception ex)
{
File.AppendAllText(logPath + "\\SSHErrorLog.log", "[]*******" + DateTime.Now + " Error in OnChanged function(second if): " + ex.Message.ToString() + Environment.NewLine);
}
}
}
}
}
}

Confusion in Combining 4 Functions

please bear with me if my codes are messy or bulky, I am a real beginner which started programming a month ago with no background at all. I now have 4 functions created searchComByAuthor();, searchComByStartDate();, searchComByEndDate(); and searchComByKeywords();. But the problem is, I don't know how to combine them and make them like filters. User can choose to fill up any textboxes and when the user clicks on "Analyse" button, the combined function will do the work. Now they are all working separately, I only call the functions one by one to test out if they work or not.
Screenshot:
searchComByAuthor:
private void searchComByAuthor()
{
// Process the list of files found in the directory.
string[] fileEntries = Directory.GetFiles(sourceDir);
foreach (string fileName in fileEntries)
{
try
{
XmlDocument xmlDoc = new XmlDocument(); //* create an xml document object.
string docPath = fileName;
xmlDoc.Load(docPath); //* load the XML document from the specified file.
XmlNodeList nodeList = xmlDoc.GetElementsByTagName("item");
foreach (XmlNode node in nodeList)
{
XmlElement itemElement = (XmlElement)node;
string itemAuthor = itemElement.GetElementsByTagName("author")[0].InnerText;
if (itemAuthor.ToLower() == txtComAuthor.Text.ToString().ToLower())
{
string itemTitle = itemElement.GetElementsByTagName("title")[0].InnerText;
string itemDate = itemElement.GetElementsByTagName("pubDate")[0].InnerText;
string itemDescription = itemElement.GetElementsByTagName("description")[0].InnerText;
string itemXMLFile = Path.GetFileNameWithoutExtension(fileName);
richComByTemplate.AppendText("SYMBOL: " + itemXMLFile + "\nAUTHOR: " + itemAuthor + "\nDATE: " + itemDate +
"\nTITLE: " + itemTitle + "\nDESCRIPTION: " + itemDescription + "\n\n--------\n\n");
}
//else
//{
// richComResults.AppendText("There is no author " + txtComAuthor.Text.ToString().ToLower() + ". Please ensure you are using a correct author name.");
//}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
int pointer = 0;
int index = 0;
string keyword = txtComAuthor.Text;
string shadow = richComByTemplate.Text.ToLower();
while (true)
{
//Searching in the copy/shadow
index = shadow.IndexOf(keyword, pointer);
//if keyword not found then the loop will break
if ((index == -1) || (String.IsNullOrEmpty(keyword)))
{
break;
}
richComByTemplate.Select(index, keyword.Length);
richComByTemplate.SelectionColor = Color.Red;
richComByTemplate.SelectionFont = new System.Drawing.Font(richComByTemplate.Font, FontStyle.Bold);
pointer = index + keyword.Length;
}
}
searchComByStartDate:
private void searchComByStartDate()
{
// Process the list of files found in the directory.
string[] fileEntries = Directory.GetFiles(sourceDir);
foreach (string fileName in fileEntries)
{
XmlDocument xmlDoc = new XmlDocument(); //* create an xml document object.
string docPath = fileName;
xmlDoc.Load(docPath); //* load the XML document from the specified file.
XmlNodeList nodeList = xmlDoc.GetElementsByTagName("item");
foreach (XmlNode node in nodeList)
{
XmlElement itemElement = (XmlElement)node;
string itemDate = itemElement.GetElementsByTagName("pubDate")[0].InnerText;
CultureInfo provider = CultureInfo.InvariantCulture;
if (DateTime.Parse(itemDate) >= DateTime.ParseExact(txtComStartDate.Text, "dd/MM/yy", provider))
{
string itemAuthor = itemElement.GetElementsByTagName("author")[0].InnerText;
string itemTitle = itemElement.GetElementsByTagName("title")[0].InnerText;
string itemDescription = itemElement.GetElementsByTagName("description")[0].InnerText;
string itemXMLFile = Path.GetFileNameWithoutExtension(fileName);
richComByTemplate.AppendText("SYMBOL: " + itemXMLFile + "\nAUTHOR: " + itemAuthor + "\nDATE: " + itemDate +
"\nTITLE: " + itemTitle + "\nDESCRIPTION: " + itemDescription + "\n\n--------\n\n");
}
}
}
}
searchComByEndDate:
private void searchComByEndDate()
{
// Process the list of files found in the directory.
string[] fileEntries = Directory.GetFiles(sourceDir);
foreach (string fileName in fileEntries)
{
XmlDocument xmlDoc = new XmlDocument(); //* create an xml document object.
string docPath = fileName;
xmlDoc.Load(docPath); //* load the XML document from the specified file.
XmlNodeList nodeList = xmlDoc.GetElementsByTagName("item");
foreach (XmlNode node in nodeList)
{
XmlElement itemElement = (XmlElement)node;
string itemDate = itemElement.GetElementsByTagName("pubDate")[0].InnerText;
CultureInfo provider = CultureInfo.InvariantCulture;
if (DateTime.Parse(itemDate) <= DateTime.ParseExact(txtComEndDate.Text, "dd/MM/yy", provider))
{
string itemAuthor = itemElement.GetElementsByTagName("author")[0].InnerText;
string itemTitle = itemElement.GetElementsByTagName("title")[0].InnerText;
string itemDescription = itemElement.GetElementsByTagName("description")[0].InnerText;
string itemXMLFile = Path.GetFileNameWithoutExtension(fileName);
richComByTemplate.AppendText("SYMBOL: " + itemXMLFile + "\nAUTHOR: " + itemAuthor + "\nDATE: " + itemDate +
"\nTITLE: " + itemTitle + "\nDESCRIPTION: " + itemDescription + "\n\n--------\n\n");
}
}
}
}
searchComByKeywords:
private void searchComByKeywords()
{
List<TextBox> boxes = new List<TextBox>();
boxes.Add(txtComKeyword1);
boxes.Add(txtComKeyword2);
boxes.Add(txtComKeyword3);
boxes.Add(txtComKeyword4);
// Process the list of files found in the directory.
string[] fileEntries = Directory.GetFiles(sourceDir);
foreach (string fileName in fileEntries)
{
try
{
XmlDocument xmlDoc = new XmlDocument(); //* create an xml document object.
string docPath = fileName;
xmlDoc.Load(docPath); //* load the XML document from the specified file.
XmlNodeList nodeList = xmlDoc.GetElementsByTagName("item");
foreach (XmlNode node in nodeList)
{
XmlElement itemElement = (XmlElement)node;
string itemDescription = itemElement.GetElementsByTagName("description")[0].InnerText;
if (txtComKeyword1.Text != (String.Empty) && itemDescription.ToLower().Contains(txtComKeyword1.Text.ToLower()) ||
txtComKeyword2.Text != (String.Empty) && itemDescription.ToLower().Contains(txtComKeyword2.Text.ToLower()) ||
txtComKeyword3.Text != (String.Empty) && itemDescription.ToLower().Contains(txtComKeyword3.Text.ToLower()) ||
txtComKeyword4.Text != (String.Empty) && itemDescription.ToLower().Contains(txtComKeyword4.Text.ToLower()))
{
string itemTitle = itemElement.GetElementsByTagName("title")[0].InnerText;
string itemDate = itemElement.GetElementsByTagName("pubDate")[0].InnerText;
string itemAuthor = itemElement.GetElementsByTagName("author")[0].InnerText;
string itemXMLFile = Path.GetFileNameWithoutExtension(fileName);
richComByTemplate.AppendText("SYMBOL: " + itemXMLFile + "\nAUTHOR: " + itemAuthor + "\nDATE: " + itemDate +
"\nTITLE: " + itemTitle + "\nDESCRIPTION: " + itemDescription + "\n\n--------\n\n");
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
foreach (TextBox box in boxes)
{
int pointer = 0;
int index = 0;
string keyword = box.Text;
string shadow = richComByTemplate.Text.ToLower();
while (true)
{
//Searching in the copy/shadow
index = shadow.IndexOf(keyword, pointer);
//if keyword not found then the loop will break
if ((index == -1) || (String.IsNullOrEmpty(keyword)))
{
break;
}
//Customising the original data
richComByTemplate.Select(index, keyword.Length);
richComByTemplate.SelectionColor = Color.Red;
richComByTemplate.SelectionFont = new System.Drawing.Font(richComByTemplate.Font, FontStyle.Bold);
pointer = index + keyword.Length;
}
}
}

You have a very significant amount of repeated code in your functions.
You can achieve your goal while simplifying your code by combining your four functions into a single function. Give that single function a parameter that is a list of conditions that must be met in order to include a given record (assuming all conditions must apply to select the record).
In your case it looks like you desire a straight match on whatever is entered in one or more text fields. Pass in the values of those text fields to your new, combined method (so that you can separate your logic from your UI) and, for each value that has a non-null, non-blank value, apply the appropriate logic test. If Author and StartDate are passed in, apply the logic that is relevant to both Author and StartDate. If both tests pass, include that record.
In order to "include that record", rather than doing what the code is currently doing:
richComByTemplate.AppendText(...)
you may wish to return a list of results and have the caller do the text appending (again, to separate your user interface from your search logic).