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my messeging Desktop application does't work on wpf c#

So Basically I'm working on this Desktop application using c# server and client and for some reason whenever I send a msg in chat it doesn't work for all users but when I send a private msg it's working and I'm not sure why.
my server code:
if (e.MessageString.Contains("#"))
{
if (e.MessageString.Substring(0, 3).Equals("All"))
{
if (!e.MessageString.Substring(4, 4).Equals("File"))
{
string toAll = e.MessageString.Substring(4, e.MessageString.Length - 4) + "\n";
server.Broadcast(toAll);
txtStatus.Dispatcher.Invoke((Action)delegate ()
{
txtStatus.Text += toAll;
});
}
else
{
System.Windows.MessageBox.Show("Cannot send a file to everyone!");
}
}
and this is my chat code:
private void btnSend_Click(object sender, RoutedEventArgs e)
{
System.Console.WriteLine("Send was clicked");
if (btnConnect.IsEnabled)
{
System.Windows.MessageBox.Show("Please connect to the local server!");
}
else if (listbox.SelectedIndex != -1)
{
if (txtMessage.Text.Length > 0 && !ifFileSelected && !txtMessage.Text.Equals(" ") && !txtMessage.Text.Equals("\n"))
{
client.WriteLine(listbox.SelectedItem.ToString().ToLower() + "#" + username + ": " + txtMessage.Text);
}
else if (ifFileSelected)
{
byte[] b1 = File.ReadAllBytes(op.FileName);
client.Write(listbox.SelectedItem.ToString() + "#File#" + fi.Name + "#");
client.Write(b1);
ifFileSelected = false;
}
else
{
System.Windows.MessageBox.Show("Please type something or choose a file to send!");
}
}
else
{
System.Windows.MessageBox.Show("Please select someone to send the message to!");
}
txtMessage.Text = "";
}

I am getting an error that reads “The given path's format is not supported.” when trying to upload audio file to sharepoint

I am able to upload other file types to share point using the lines of code below. However, when I try to upload an uadio file I get an error that reads "The given path's format is not supported" on the line where it trys to create the directory and save the file on SharePoint. The line reads System.IO.Directory.CreateDirectory(pathString);
I am suspecting the backslashes in path below my be a problem
Path
public static string CMSdocs1drive = "\\\\myserver.sharepoint.com#SSL\\DavWWWRoot\\personal\\myname_myorganisation_org_com\\";
Code To Upload And Save To SharePoint
protected void btnUpload_Click(object sender, EventArgs e)
{
if (FileUpload_Section55_6.HasFile)
{
if (ddlDocument.SelectedIndex == 0)
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('" + "Upload status: Please select the document type." + "');", true);
}
else
{
try
{
if (FileUpload_Section55_6.PostedFile.ContentLength < 2014572800)
{
{
if (ddlFilingType.SelectedIndex != 0)
{
if (!String.IsNullOrEmpty(lblCaseID0.Text) && ddlDocument.SelectedValue.ToString() == "203")
pathString = CMSProperties.CMSdocs1drive + "\\" + lblCaseID0.Text + "\\" + ddlFilingType.SelectedItem.Text + "\\" + ".Mp3";
}
if (!Directory.Exists(pathString))
{
System.IO.Directory.CreateDirectory(pathString);
// System.IO.Directory.Move(pathString);
}
if (pathString != controller.CheckIfFilePathExist(pathString))
{
controller.UploadFile(pathString, lblCaseID.Text);
}
}
}
else
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('" + "Upload status: The file is to big!" + "');", true);
}
ddlDocument.SelectedIndex = 0;
}
catch (Exception ex)
{
ex.Message.ToString();
Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('" + "Upload status: The file could not be uploaded. The following error occured:" + "');" + ex, true);
Console.WriteLine();
}
}
}
else
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('" + "Upload status: Please select file " + "');", true);
}
}

I am suspecting the backslashes in path below my be a problem
Consider using a Verbatim Operator( # ) for the path to denote that it contains escape sequence characters (the \ symbol) that should be ignored.
public static string CMSdocs1drive = "\\\\myserver.sharepoint.com#SSL\\DavWWWRoot\\personal\\myname_myorganisation_org_com\\";
with the verbatim operator you can avoid the use of additional escape sequence characters, for example:
public static string CMSdocs1drive = #"\\myserver.sharepoint.com#SSL\DavWWWRoot\personal\myname_myorganisation_org_com\";

Is there are way to fix when allowing the use of GPS, the code execution button must be pressed again on Xamarin iOS

I'm trying to make a button that takes the coordinates from the current location, calls the city from API and returns the name of the city in the searchbar.
At the moment when the button is pressed, it first asks for GPS permission but once you enable it it stops executing the logic down.
After permission, you need to press the same button again to change the name of the city in the search engine. Is there a way when the user allows the use of his location to execute the code without having to press a second time.
Code:
async void OnGetGPSLocation(System.Object sender, System.EventArgs e)
{
var status = await Permissions.CheckStatusAsync<Permissions.LocationWhenInUse>();
if (status == PermissionStatus.Denied && status == PermissionStatus.Disabled)
{
_ = await Permissions.RequestAsync<Permissions.LocationWhenInUse>();
}
else
{
try
{
var location = await Geolocation.GetLastKnownLocationAsync();
if (location != null)
{
WeatherForecast16DaysCoordinates weatherBindingData = await _restServiceForecastCoords.GetCity(GenerateRequestUriForecast3(ConstantsForecast16DaysCoords.WeatherbitEndPoint3, location));
var cityCoord = weatherBindingData.CityName;
_cityEntry.Text = cityCoord;
}
}
catch (FeatureNotSupportedException fnsEx)
{
await DisplayAlert("Alert" + Environment.NewLine + "Something is wrong.", "You have some errors: " + Environment.NewLine + fnsEx.ToString(), "OK");
}
catch (FeatureNotEnabledException fneEx)
{
await DisplayAlert("Alert" + Environment.NewLine + "Something is wrong.", "You have some errors: " + Environment.NewLine + fneEx.ToString(), "OK");
}
catch (PermissionException pEx)
{
await DisplayAlert("Alert" + Environment.NewLine + "Something is wrong.", "You have some errors: " + Environment.NewLine + pEx.ToString(), "OK");
}
catch (Exception ex)
{
await DisplayAlert("Alert" + Environment.NewLine + "Something is wrong.", "You have some errors: " + Environment.NewLine + ex.ToString(), "OK");
}
}
}
My second problem with GPS is when GPS is disconnected from the user's device. How to forward it directly to the settings to activate it.

when GPS is disconnected from the user's device. How to forward it directly to the settings to activate it.
If you want to allow the permission again when user deny it you could check the following code.
var bundleId = NSBundle.MainBundle.BundleIdentifier;
var url = new NSUrl(UIApplication.OpenSettingsUrlString + "&path=LOCATION/" + bundleId);
if(UIApplication.SharedApplication.CanOpenUrl(url))
{
UIApplication.SharedApplication.OpenUrl(url);
}

i have some login issue! would like some advice C#

if (username.Text == "" && password.Text == "")
{
MessageBox.Show("Please Enter Username and Password");
}
if (!File.Exists(username.Text + ".txt"))
{
err.SetError(username, "Username not exist"); //sets the error
//MessageBox.Show("Please Enter Your Username");
}
else
{
err.SetError(username, ""); //clears the error
err.SetError(password, "");
TextReader tr = new StreamReader(username.Text + ".txt");
string pass = tr.ReadLine();
if (pass == password.Text)
{
app.Show();
this.Hide();
}
else
{
err.SetError(password, "Password Incorrect");
// MessageBox.Show("Please Enter Your Password");
}
The issue I have occured when I tested the login with empty username and empty password, both error warning of username and message box that says "please enter username and password" show. How do I solve this so that when enter nothing will show the message box? And when user enter incorrect username or password, the warning will show for either?
I'm currently using C# Windows Forms.

The problem is your code continues after your first if statement.
You could either put a return in the if statement:
if (username.Text == "" && password.Text == "")
{
MessageBox.Show("Please Enter Username and Password");
return;
}
Or you could change the second if to an else if:
if (username.Text == "" && password.Text == "")
{
MessageBox.Show("Please Enter Username and Password");
}
else if (!File.Exists(username.Text + ".txt"))
{
err.SetError(username, "Username not exist"); //sets the error
//MessageBox.Show("Please Enter Your Username");
} else {
....
}
This way the !File.Exists doesn't get executed if the username and password are empty.

Put return
Try this :
if (username.Text == "" && password.Text == "")
{
MessageBox.Show("Please Enter Username and Password");
return;
}
if (!File.Exists(username.Text + ".txt"))
{
err.SetError(username, "Username not exist"); //sets the error
//MessageBox.Show("Please Enter Your Username");
}
else
{
err.SetError(username, ""); //clears the error
err.SetError(password, "");
TextReader tr = new StreamReader(username.Text + ".txt");
string pass = tr.ReadLine();
if (pass == password.Text)
{
app.Show();
this.Hide();
}
else
{
err.SetError(password, "Password Incorrect");
// MessageBox.Show("Please Enter Your Password");
}

start and stop data saving on .txt file using button on c#

I have a sensor that connected to pc and data comes continuously like this picture:
I want to add two start and stop button and save data from start button pressed time and stop saving data when pressed stop button.
I write this code:
richTextBox1.AppendText(textBox1.Text + "\n");
System.IO.File.WriteAllLines(#"C:\Users\Mohammad_Taghi\Desktop\a.txt",richTextBox1.Lines);
but this code save whole of data in .txt file and is not controllable.
this is that part of code on richtextbox2:
public void detectFingers(Leap.Frame frame)
{
foreach(Finger finger in frame.Fingers)
{
richTextBox2.AppendText("Finger ID: " + finger.Id + Environment.NewLine +
"Finger Type: " + finger.Type + Environment.NewLine +
"Finger Length:" + finger.Length + Environment.NewLine +
"Finger width:" + finger.Width + Environment.NewLine);
foreach (Bone.BoneType boneType in (Bone.BoneType[])Enum.GetValues(typeof(Bone.BoneType)))
{
Bone bone = finger.Bone(boneType);
richTextBox3.AppendText("Bone Type: " + bone.Type +Environment.NewLine +
"Bone Length: " +bone.Length +Environment.NewLine+
"Bone Width : " + bone.Width +Environment.NewLine +
"Previous Joint : "+bone.PrevJoint + Environment.NewLine+
"Next Joint :" + bone.NextJoint + Environment.NewLine+
"Direction : " + bone.Direction + Environment.NewLine+;
}
}
}

As data comes in continuously you need to save from when the data should be stored uptil when. Printing the textBox1.Text will, of course, print everything.
You need to set a variable to store the information after the "Start" button is pressed until the "Stop" button is pressed. Here is some code:
private bool isLogging = false;
private string myLog = "";
//This is where the input from the sensor arrives
private void myInput(string s)
{
textBox1.Text += s + "\n";
if (isLogging)
myLog += s + "\n";
}
private void buttonOnStart_Click(object sender, EventArgs e)
{
//Clear log string
myLog = "";
//Start logging
isLogging = true;
}
private void buttonOnStop_Click(object sender, EventArgs e)
{
//Stop logging
isLogging = false;
//Pring only the logged messages
System.IO.File.WriteAllLines(#"C:\Users\Mohammad_Taghi\Desktop\a.txt", myLog);
}