Develop Reference

How to perform Click-Event on a hidden button

In my C# form I have two buttons
button1.Hide()
private void button2_Click(object sender, EventArgs e)
{
button1.PerformClick();
}
The button1 is hidden at form loading, I want the logic behind button1 to be perfomed when it's hidden too.

Just let the function outside become another function, then you can call function although you hidden the button1.
private void button1(object sender, EventArgs e)
{
_button1();
}
private void button2(object sender, EventArgs e)
{
_button1();
}
//Here is the function
void _button1()
{
...
}

If your Button is hidden, it seems that you need the functionality behind not or just in special cases. Keeping functionality out of events is often a simple solution to avoid problems in the future.
private void btn_Reload_Click(object sender, EventArgs e)
{
// reload here - maybe you reload all your employees from a datasource
}
private void btn_Reload_With_Calculation_Click(object sender, EventArgs e)
{
// you can use functionality here from a another button and call the
btn_Reload_Click(this, EventArgs.Empty); // DON'T DO THIS IN MY OPINION
// ....
}
Maybe this solution is better even if you need the functionality at other workflows.
private void btn_Reload_Click(object sender, EventArgs e)
{
Reload();
}
private void btn_Reload_With_Calculation_Click(object sender, EventArgs e)
{
Reload();
Calculate();
}
void Reload() { }
void Calculate() { }

How to make a screen share application

I am trying to make a simple screen share application in C# and found this guide: https://www.c-sharpcorner.com/uploadfile/ulricht/how-to-create-a-simple-screen-sharing-application-in-C-Sharp/ and followed it but it doesn't work i tried it on the same computer and on two different PCs but nothing seems to work
//Host
public partial class ScreenShareHandler : Form
{
RDPSession x = new RDPSession();
public ScreenShareHandler()
{
InitializeComponent();
}
private void ScreenShareHandler_Load(object sender, EventArgs e)
{
}
private void Incoming(object Guest)
{
IRDPSRAPIAttendee MyGuest = (IRDPSRAPIAttendee)Guest;//???
MyGuest.ControlLevel = CTRL_LEVEL.CTRL_LEVEL_INTERACTIVE;
}
private void button1_Click(object sender, EventArgs e)
{
x.OnAttendeeConnected += Incoming;
x.Open();
}
private void button2_Click(object sender, EventArgs e)
{
IRDPSRAPIInvitation Invitation = x.Invitations.CreateInvitation("Trial", "MyGroup", "", 10);
textBox1.Text = Invitation.ConnectionString;
}
private void button3_Click(object sender, EventArgs e)
{
x.Close();
x = null;
}
}
//Client
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
string Invitation = textBox1.Text;// "";// Interaction.InputBox("Insert Invitation ConnectionString", "Attention");
axRDPViewer1.Connect(Invitation, "User1", "");
}
private void button2_Click(object sender, EventArgs e)
{
axRDPViewer1.Disconnect();
}
}

As written in my comments:
Have you hooked up the eventhandlers correctly? If you click on the button in the designer you can go to the Events Tab in the Property-window and check if the Click-event points to the right eventhandler. Another way to check if the correct handler is used is to put a breakpoint inside each handler. Then debug and check if you get into the right method when you click the button. If not you didn't hook up the Eventhandlers correctly.

How to disable a combobox on clicking on another combox list data in C sharp?

I want to design a windows form using C sharp on Visual Studio 2013.
I go through the Source from here. but did not got it properly.
for that I have 3 combobox. I want to disable combobox2 when I click on combobox1 NSSCM element and enable when click on NSSFO element.
Below is my part of code snippet:
namespace NSE_First_Form
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
MaximizeBox = false;
MinimizeBox = false;
if (true)
{
comboBox1.Items.Add(Exchange.NSSCM.ToString());
comboBox1.Items.Add(Exchange.NSSFO.ToString());
comboBox1.Items.Add(Exchange.BSSCM.ToString());
}
}
private void button1_Click(object sender, EventArgs e)
{
string selectedItem = string.Empty;
ProcessValue(selectedItem);
}
public enum Exchange
{
NSSCM = 1,
NSSFO = 2,
BSSCM = 3
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
}
private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
}
private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
{
}
}

Try this:
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if (comboBox1.SelectedIndex == 0)
comboBox2.Enabled = false;
if (comboBox1.selectedIndex == 1)
comboBox2.Enabled = true;
}

Try this:
//This will disable combobox2 on the click of it
private void comboBox1_Click(object sender, EventArgs e)
{
comboBox2.Enabled = false;
}
//This will enable combobox2 on the click of it
private void comboBox1_Click(object sender, EventArgs e)
{
comboBox2.Enabled = true;
}
Because you want it on click, use the CLICK event, instead of SelectedIndexChange event.

Can't put more than one number in the textbox. in my Simple Calculator program

Need help in making a simple calculator. i can't put more than one number in my calculator's textbox. Everytime i put a second number it replaces the first one need help!
I can't exceed more than one input number in my Calculator's Textbox instead it replaces the first number with a second number input
namespace Calculator_Project
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void InputOutputArea_TextChanged(object sender, EventArgs e)
{
}
private void One_Click(object sender, EventArgs e)
{
int Input = 1;
InputOutputArea.Text = Input.ToString();
}
private void Two_Click(object sender, EventArgs e)
{
int Input = 2;
InputOutputArea.Text = Input.ToString();
}
private void Three_Click(object sender, EventArgs e)
{
}
private void Four_Click(object sender, EventArgs e)
{
}
private void Five_Click(object sender, EventArgs e)
{
}
private void Six_Click(object sender, EventArgs e)
{
}
private void Seven_Click(object sender, EventArgs e)
{
}
private void Eight_Click(object sender, EventArgs e)
{
}
private void Nine_Click(object sender, EventArgs e)
{
}
private void Eql_Click(object sender, EventArgs e)
{
}
private void AddB_Click(object sender, EventArgs e)
{
}
private void Minus_Click(object sender, EventArgs e)
{
}
private void MultiplyB_Click(object sender, EventArgs e)
{
}
private void DivideB_Click(object sender, EventArgs e)
{
}
private void Zero_Click(object sender, EventArgs e)
{
}
private void ResetB_Click(object sender, EventArgs e)
{
InputOutputArea.Clear();
}
}
}

You should use
InputOutputArea.Text += Input.ToString();
(note the '+') in order to append to a text box.

private void Two_Click(object sender, EventArgs e)
{
int Input = 2;
InputOutputArea.Text += Input.ToString();
}
You must use += to add other text to next of first text

Here is your problem:
InputOutputArea.Text = Input.ToString();
This replaces the content of the textbox instead of adding to it.
InputOutputArea.Text += Input.ToString();
the above code should do as you ask.
Good to remember is that concatenating strings with + is rather inefficient, so don't do this in performance critical code unless absolutely necessary. In those cases a String-builder is almost always better.

Every answers talking about the Concatenation of the previous text with the current, But I would like to suggest something more than that;
You need not to create separate event handlers for all your buttons that are doing same tasks, Hope that the Text of each button will be the number that you need to display in the textBox(say btnOne will holds 1 and btnTwoholds 2 and so on). By make use of this Text we can reuse the handlers like the following, Let btnNumber_Click be the handler and which is defined like the following:
private void btnNumber_Click(object sender, EventArgs e)
{
Button currentButton = sender as Button;
InputOutputArea.Text += currentButton.Text;
}

How to propagate the name change of Form's UI controls's throughtout all the .cs in project

In C# , Winform, I have created a form and bunch of UI controls on it. I have changed the name of the controls through Properties windows but the following automated generated code did not update automatically. However, the InitializeComponent code is automatically updated though. My problem is now that I don't remember which box or whihc label I renamed to certain name.. Two questions : How could I have done this more efficiently to begin with? Question 2) Is there anything I could do now to make it automatically change the corresponding names? I have heard of refactoring but I don't know if I could have used it here and how? I appreciate any help.
public partial class frmMyInterface : Form
{
public frmMyInterface()
{
InitializeComponent();
}
private void frmMyInterface_Load(object sender, EventArgs e)
{
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void label4_Click(object sender, EventArgs e)
{
}
private void label1_Click(object sender, EventArgs e)
{
}
private void label2_Click(object sender, EventArgs e)
{
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
}
private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
}
}

Rename each these event handlers and then on the property window, reassign the events selecting from the dropdrown. Or delete these event handlers and double click on each event in the property window and this time it will update it for you