How to change button color on button click in C#?

Question

I am creating an online test application, in which I am generating approximately 100 buttons at run time on form load. Here is the piece of code:w

private void addQuestion_Reviewbutton()
        {
            for (int i = 1; i <= clsGlobalVars.gnTotalQuestion; i++)
            {
                Button button = new Button();
                button.Location = new Point(160, 30 * i + 10);
                button.Click += new EventHandler(ButtonClickOneEvent);                
                button.Tag = i;                
                button.Name = "Question" + i;
                button.Text = i.ToString();
                button.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.button));
                button.BackgroundImageLayout = ImageLayout.Stretch;//.Zoom;
                button.FlatAppearance.BorderSize = 0;
                button.Size = new System.Drawing.Size(47, 41);
                button.BackColor = Color.Transparent;
                button.FlatStyle = FlatStyle.Flat;
                button.Font = new System.Drawing.Font("Segoe UI Semibold", 12);
                button.ForeColor = Color.White;
                button.Cursor = Cursors.Hand;
                flowLayoutPanel1.Controls.Add(button);
                
            }
        }

and on this button click, I am changing the background-color.

void ButtonClickOneEvent(object sender, EventArgs e)
        {
            Button button = sender as Button;
            //button.BackColor = Color.Yellow;
            button.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.button_Orange));
            lblQuestionNo.Text = ((int)button.Tag).ToString()+".";
            btnNext.Focus();
            
        }

I have a button on the form Named "Next". Now my problem is that if I am currently in question "1." and I press the button next I want to change the background image of the button whose text is "2".

So if current Button has Tag == 1 you want to find the Button with Tag == 2? Why not just loop over these buttons? Or query with a help of Linq? var nextButton = flowLayoutPanel1.Controls.OfType<Button>().FirstOrDefault(btn => btn.Tag == currentButton.Tag + 1); — Dmitrii Bychenko
– Dmitrii Bychenko, Commented Jun 30, 2020 at 11:25
You could pass the next Button Tag as an CommandArgument to save you the trouble of having to convert back to int to incrememt. — Filburt
– Filburt, Commented Jun 30, 2020 at 11:26
You should not be using WebForms for new projects in 2021. It's been obsolete for 13 years already. Yikes. — Dai
– Dai, Commented Sep 2, 2021 at 5:18
"I need your valuable guidance to solve this problem." - my guidance is for you to stop immediately and start-over in ASP.NET Core, or at least ASP.NET MVC (for .NET Framework), otherwise you'll have sunk more and more time into a web-framework that does not work well with modern web-browsers. For example, every "event" handled on the server requires a form POST, which breaks your user's browsers' Back button, which is a really crappy UX (so if the user submits answers for a dozen questions (each requiring their own POST) and then accidentally navigate back they've lost everything. — Dai
– Dai, Commented Sep 2, 2021 at 5:20

user3682728 · Accepted Answer · 2021-12-24 11:22:16Z

1

Yo check this !

tldr; the guidance are

Is the click event go to ButtonClickOneEvent ?
How to call other button
...

profit?

  protected void Page_Load(object sender, EventArgs e)
 {
    addQuestion_Reviewbutton();
 }

  void ButtonClickOneEvent(object sender, EventArgs e)
 {
     Button button = sender as Button;

     var currentbtn_id = button.ID; 
     int nextid =  Convert.ToInt32( currentbtn_id.Substring("Question".Length)) + 1;
    var nextBtn = flowLayoutPanel1.FindControl("Question"+ nextid.ToString() );
     (nextBtn as Button).BackColor = Color.Red;

 }

answered Dec 24, 2021 at 11:22

user3682728

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