Creating a loop(?)

[Xakzi]

Hello!

In programming this is one of the difficult coding I have yet to master.

I have made a (mini) program that contains textboxes and a button.

Works like when you write a number and then press the button it should change the color of that many textboxes.. example:

The code is written to make this manually... But how would I code this into a loop or something like that?

My current code:

Spoiler

private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "1")
            {
                textBox2.BackColor = Color.DarkRed;
                textBox2.Visible = true;
                textBox3.Visible = false;
                textBox4.Visible = false;
                textBox5.Visible = false;
                textBox6.Visible = false;
                textBox7.Visible = false;
                textBox8.Visible = false;
            }
            else if (textBox1.Text == "2")
            {
                textBox2.BackColor = Color.DarkRed;
                textBox2.Visible = true;
                textBox3.BackColor = Color.DarkRed;
                textBox3.Visible = true;
                textBox4.Visible = false;
                textBox5.Visible = false;
                textBox6.Visible = false;
                textBox7.Visible = false;
                textBox8.Visible = false;
            }
            else if (textBox1.Text == "3")
            {
                textBox2.BackColor = Color.DarkRed;
                textBox2.Visible = true;
                textBox3.BackColor = Color.DarkRed;
                textBox3.Visible = true;
                textBox4.BackColor = Color.DarkRed;
                textBox4.Visible = true;
                textBox5.Visible = false;
                textBox6.Visible = false;
                textBox7.Visible = false;
                textBox8.Visible = false;
            }
            else if (textBox1.Text == "4")
            {
                textBox2.BackColor = Color.DarkRed;
                textBox2.Visible = true;
                textBox3.BackColor = Color.DarkRed;
                textBox3.Visible = true;
                textBox4.BackColor = Color.DarkRed;
                textBox4.Visible = true;
                textBox5.BackColor = Color.DarkRed;
                textBox5.Visible = true;
                textBox6.Visible = false;
                textBox7.Visible = false;
                textBox8.Visible = false;
            }
            else if (textBox1.Text == "5")
            {
                textBox2.BackColor = Color.DarkRed;
                textBox2.Visible = true;
                textBox3.BackColor = Color.DarkRed;
                textBox3.Visible = true;
                textBox4.BackColor = Color.DarkRed;
                textBox4.Visible = true;
                textBox5.BackColor = Color.DarkRed;
                textBox5.Visible = true;
                textBox6.BackColor = Color.DarkRed;
                textBox6.Visible = true;
                textBox7.Visible = false;
                textBox8.Visible = false;
            }
            else if (textBox1.Text == "6")
            {
                textBox2.BackColor = Color.DarkRed;
                textBox2.Visible = true;
                textBox3.BackColor = Color.DarkRed;
                textBox3.Visible = true;
                textBox4.BackColor = Color.DarkRed;
                textBox4.Visible = true;
                textBox5.BackColor = Color.DarkRed;
                textBox5.Visible = true;
                textBox6.BackColor = Color.DarkRed;
                textBox6.Visible = true;
                textBox7.BackColor = Color.DarkRed;
                textBox7.Visible = true;
                textBox8.Visible = false;
            }
            else if (textBox1.Text == "7")
            {
                textBox2.BackColor = Color.DarkRed;
                textBox2.Visible = true;
                textBox3.BackColor = Color.DarkRed;
                textBox3.Visible = true;
                textBox4.BackColor = Color.DarkRed;
                textBox4.Visible = true;
                textBox5.BackColor = Color.DarkRed;
                textBox5.Visible = true;
                textBox6.BackColor = Color.DarkRed;
                textBox6.Visible = true;
                textBox7.BackColor = Color.DarkRed;
                textBox7.Visible = true;
                textBox8.BackColor = Color.DarkRed;
                textBox8.Visible = true;
            }
            else
            {
                MessageBox.Show("Please choose a number between 1 to 7!!");
            }

Would really appriciate help for this one.. I have tried to look into loops & such.. Couldn't figure it out :/
And as I said at the top.. Loops and try's & do has been the hardest part of me to understand fully (Still learning to code )

~Xakzi

 

[blkancientss]

TextBox[] textboxes = {textBox2, textBox3, textBox4, textBox5,textBox6, textBox7, textBox8};
int number = Convert.ToInt32(textBox1.Text);
if (number <= 7 && number >= 1)
{
    for (int i = 0; i < textboxes.length; i++)
    {
        if (i < number)
	{
	    textboxes[i].BackColor = Color.DarkRed;
	    textboxes[i].Visible = true;
	}
	else 
	{
	    textboxes[i].Visible = false;
	}
}
else
{
    MessageBox.Show("Please choose a number between 1 to 7!!");
}

Alright, and now for an explanation.

Firstly we will create an array of textboxes that holds all the text boxes that will be changed.
Then we get the users input and convert it into an integer.
Next we create a loop to loop through all the TextBoxes in the array.
If the number we entered is less than i, we know we need to show this TextBox and set its color to red and make it visible, otherwise we set its visibility to false.

 

[fallenfate]

Also, to expand a little on the explanation, arrays start at 0 being the first element. So this section:

if (number <= 7 && number >= 1)
{
for (int i = 0; i < textboxes.length; i++)

is checking if the number is between 1 and 7 on the input, then for the loop it checks between 0 and 6 (textboxes array length), which make up the range of 7 numbers you could input. So if you had a max of 12 boxes that could appear and be coloured, it would check between 0 and 11.