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How to validate textbox value while user enters and display error message?

So, I have to code for a method that validates whether the string that saves name contains alphabets only, no numbers. The validation of textbox values should apply when the user enters by textchanged event before submitting the form and display an error message of red color on the label. My code works but the problem is when I enter a numeric number in text box, the label displays error which stays even when I delete the text box value and enter the alphabetic string.
I have declared a method which assign error string to label, and is called if regular expression does not match with the text box input, during text changed event.
public void Validator()
{
Calculate_Salary.Enabled = false;
label4.Text = "Please enter only alphabetical letters";
}
private void _Name_TextChanged(object sender, EventArgs e)
{
Regex pattern = new Regex("/^[A-Za-z]+$/");
string name = _Name.Text;
if (pattern.IsMatch(name))
{
Calculate_Salary.Enabled = true;
label4.Text = "";
}
else
{
Validator();
}
}

Just clear the textbox before you validate:
public void Validator()
{
Calculate_Salary.Enabled = false;
label4.Text = "Please enter only alphabetical letters";
}
private void _Name_TextChanged(object sender, EventArgs e)
{
label4.Text = "";
Regex pattern = new Regex("/^[A-Za-z]+$/");
string name = _Name.Text;
if (pattern.IsMatch(name))
{
Calculate_Salary.Enabled = true;
}
else
{
Validator();
}
}

Your Regex comparison is wrong try this code:
public void Validator()
{
Calculate_Salary.Enabled = false;
label4.Text = "Please enter only alphabetical letters";
}
private void _Name_TextChanged(object sender, EventArgs e)
{
label4.Text = "";
string name = _Name.Text;
if (Regex.IsMatch(name, #"^[a-zA-Z]+$"))
Calculate_Salary.Enabled = true;
else
Validator();
}

I changed the validation code. It seems to work now.
private void _Name_TextChanged(object sender, EventArgs e)
{
label4.Text = string.Empty;
string name = _Name.Text;
if (Regex.IsMatch(_Name.Text, "^[a-zA-Z]+$") || _Name.Text=="")
{
Calculate_Salary.Enabled = true;
}
else
{
Calculate_Salary.Enabled = false;
label4.Text = Validator();
}
}

How can I make that the user will be able to search for a multiple texts with textBox?

Today when I type something any text in textBox1 and then click the start button it will search inside files for the text i typed in textBox1.
Now I want to add something somehow that if the user type in the textBox1 for example: hello,hi it will search for hello and also for hi in the files. Not as one string/text but two separated. If I type: hello,hi,world now it will search in same time same files also for hello hi and world.
The textchanged event
private void textBox1_TextChanged(object sender, EventArgs e)
{
if (textBox1.Text != "" && textBox3.Text != "" && Directory.Exists(textBox3.Text))
{
startButton.Enabled = true;
Properties.Settings.Default["Setting2"] = textBox1.Text;
Properties.Settings.Default.Save();
}
else
{
startButton.Enabled = false;
}
}
The start button click event
private void startButton_Click(object sender, EventArgs e)
{
label21.Visible = true;
startButton.Enabled = false;
stopButton.Enabled = true;
pauseresumeButton.Enabled = true;
timer1.Start();
if (!backgroundWorker1.IsBusy)
{
SetWorkerMode(true);
backgroundWorker1.RunWorkerAsync();
}
}
Dowork event
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
_stopwatch.Restart();
DirSearch(textBox3.Text, textBox2.Text, textBox1.Text, worker, e);
_stopwatch.Stop();
}
The DirSearch method where I search for the text in files.
void DirSearch(string rootDirectory, string filesExtension, string textToSearch, BackgroundWorker worker, DoWorkEventArgs e)
{
List<string> filePathList = new List<string>();
List<string> restrictedFiles = new List<string>();
int overallfiles = 0;
int numberoffiles = 0;
int numberofdirs = 0;
try
{
filePathList = SearchAccessibleFilesNoDistinct(rootDirectory, null).ToList();
}
catch (Exception err)
{
string ad = err.ToString();
}
foreach (string file in filePathList)
{
try
{
_busy.WaitOne();
if (worker.CancellationPending == true)
{
e.Cancel = true;
return;
}
List<MyProgress> prog = new List<MyProgress>();
int var = File.ReadAllText(file).Contains(textToSearch) ? 1 : 0;
overallfiles++;
if (var == 1)
{
numberoffiles++;
prog.Add(new MyProgress { Report1 = file, Report2 = numberoffiles.ToString() });
backgroundWorker1.ReportProgress(0, prog);
}
numberofdirs++;
label1.Invoke((MethodInvoker)delegate
{
label1.Text = numberofdirs.ToString();
label1.Visible = true;
});
}
catch (Exception)
{
restrictedFiles.Add(file);
continue;
}
}
}
In DirSearch the variable textToSearch contains the text I typed in textBox1.
If I typed in textBox1 only HI so like it is now it will search in each file for the existing of HI.
But if I type HI,HELLO,WORLD
Now I want it to search for existing in each file of HI HELLO WORLD not as one text string but each word on it's own existing.
If I type Hi HELLO WORLD then it will search it as one string/text but once the user put , between it should search each word/text.

You can split the input in the textbox based on space, comma's or any other separator and then pass these as individual inputs to your search method, hope this helps

How to show OpenFileDialog selected directory in a textbox

So, I set up a file browser, fully working.
But now I want to take the end location where you went and put that location into a TextBox. Which can still be typed in by the user for if they want to manually type the file location.
private void button1_Click(object sender, EventArgs e)
{
int size = -1;
DialogResult result = openFileDialog1.ShowDialog();
if (result == DialogResult.OK)
{
string file = openFileDialog1.FileName;
try
{
string text = File.ReadAllText(file);
size = text.Length;
}
catch (IOException) { }
}
Console.WriteLine(size);
Console.WriteLine(result);
}

You can get the full path
textBox1.Text = file;
and the last folder name
string lastFolderName = Path.GetFileName(Path.GetDirectoryName(file));
textBox1.Text = lastFolderName;
in your code you can use like below, if you want to use the location from another scope then make file variable global
string file = "";
private void button1_Click(object sender, EventArgs e)
{
int size = -1;
DialogResult result = openFileDialog1.ShowDialog();
if (result == DialogResult.OK)
{
file = openFileDialog1.FileName;
try
{
string text = File.ReadAllText(file);
size = text.Length;
textBox1.Text = file; // for full location
textBox2.Text = Path.GetFileName(Path.GetDirectoryName(file)); // for last folder name
}
catch (IOException)
{
}
}
}
and then
private void textBox1_TextChanged(object sender, EventArgs e)
{
textBox2.Text = file;
}

.Reading and writing to a file from the same textbox

I have a windows form that reads strings from a file and shows them all in a textbox when I press a button.
private void buttonTxt_Click(object sender, EventArgs e)
{
string[] Test = File.ReadAllLines("C:\\testfile.txt");
for (int i = 0; i < testfile.Length; i++)
{
TextBox.Text += testfile[i];
}
}
I'd like to make two radio buttons. So that first button lets my program work the way I described (by default) AND second radio button makes it work vice versa -- so that I could write in a textbox myself and when I press a button it writes a new line to the same file. Is there a way to do it?

Simply add an if statement in this event handler and implement both sending and receiving the data. Done. Sample in principle:
private const string FilePath = #"C:\testfile.txt";
private void buttonTxt_Click(object sender, EventArgs e)
{
if (radioReadMode.Checked) // check which radio button is selected
{ // read mode
string[] Test = File.ReadAllLines(FilePath);
for (int i = 0; i < testfile.Length; i++)
TextBox.Text += testfile[i];
}
else
{ // write mode
File.WriteAllText(FilePath, TextBox.Text);
}
}

I believe this is what you might be looking for. If radio button 1 is checked then if the file exists it will read that file and put it into a textbox in the form. If you switch to radio button 2. You can type in the text box and then when you press the button it will append it to the file.
public partial class Form1 : Form
{
System.IO.StreamReader sr;
System.IO.StreamWriter sw;
public Form1()
{
InitializeComponent();
radioButton1.Checked = true;
}
private void button1_Click(object sender, EventArgs e)
{
if (radioButton1.Checked == true)
{
if (System.IO.File.Exists("C:\\testfile.txt"))
{
try
{
sr = new System.IO.StreamReader("C:\\testfile.txt");
while (!sr.EndOfStream)
{
textBox1.Text += sr.ReadLine() + "\r\n";
}
}
finally
{
sr.Close();
sr.Dispose();
}
}
}
if (radioButton2.Checked == true)
{
if (System.IO.File.Exists("C:\\testfile.txt"))
{
try
{
sw = new System.IO.StreamWriter("C:\\testfile.txt", true);
string result = textBox1.Text;
string[] lststr = result.Split(new Char[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries);
foreach (string s in lststr)
{
sw.WriteLine(s);
}
}
finally
{
sw.Flush();
sw.Close();
sw.Dispose();
}
}
}
}
private void radioButton1_CheckedChanged(object sender, EventArgs e)
{
textBox1.Clear();
textBox1.ReadOnly = true;
}
private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
textBox1.Clear();
textBox1.ReadOnly = false;
}
}

Yes, there's a way. Just add another button to your form and inside read the text from the text box this way:
var textBoxContent = TextBox.Text;
and save it to your file this way
File.WriteAllText("C:\\testfile.txt", textBoxContent);
Note: I recommend getting the path to your file into a variable

How to compare new and previous value in combobox?

i have datagridview and column in it,and type is combobox.Combobox value's are used from sql data base.In combobox "Status" i have 5 different item value's.What i want is that when i change item value from combobox and press "save" button ,i want to check which value was before this one(before save) and say:
private void m02BindingNavigatorSaveItem_Click(object sender, EventArgs e)
{
try
{
if (StatusTextBox.Text == "3" && // + want to ask here if previous statusTextBox.text was "1" then to execute lines down if not goes to 'else')
{
DialogResult mbox = MessageBox.Show("do you want to save today's date and time?", "", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
datumOtvaranjaDateTimePicker.Focus();
if (mbox == DialogResult.Yes)
{
datumOtvaranjaDateTimePicker.Value = DateTime.Now;
}
Save();
Refresh();
}
else
{
MessageBox.Show("you cant do that!!!" + Environment.NewLine + "Check what you typed and try again", "Upozorenje", MessageBoxButtons.OK, MessageBoxIcon.Warning);
Refresh();
}
}
catch (Exception)
{
}
}

Look at this other answer
You can handle the ComboBox.Enter event. Then save off the
SelectedItem or SelectedValue to a member variable
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
comboBox1.Enter += comboBox1_Enter;
}
private void comboBox1_Enter(object sender, EventArgs e)
{
m_cb1PrevVal = comboBox1.SelectedValue;
}
private void RestoreOldValue()
{
comboBox1.SelectedValue = m_cb1PrevVal;
}
}