C# Enable/Disable multiple textbox based on combobox selection

Question

I am just an ordinary guy who is learning how to code. I don't like when code looks sloppy and can be consolidated. With that being said I need to consolidate some code, but I have failed to find information on how to do it.

I am trying to enable/disable multiple textbox based of combobox selection.

Here is the long and ugly code I am trying to consolidate

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
    {
        int Combobox_Process_Selected_Index = comboBox2.SelectedIndex;
        if (Combobox_Process_Selected_Index == 0)
        {
            textBox2.Enabled = false;
            textBox3.Enabled = false;
            textBox4.Enabled = false;
            textBox5.Enabled = false;
            textBox6.Enabled = false;
            textBox7.Enabled = false;
            textBox8.Enabled = false;
            textBox9.Enabled = false;
            textBox10.Enabled = false;
            textBox11.Enabled = false;
            textBox12.Enabled = false;
            textBox13.Enabled = false;
        }
        if (Combobox_Process_Selected_Index == 1)
        {
            textBox2.Enabled = true;
            textBox3.Enabled = false;
            textBox4.Enabled = false;
            textBox5.Enabled = false;
            textBox6.Enabled = false;
            textBox7.Enabled = false;
            textBox8.Enabled = false;
            textBox9.Enabled = false;
            textBox10.Enabled = false;
            textBox11.Enabled = false;
            textBox12.Enabled = false;
            textBox13.Enabled = false;
        }
        if (Combobox_Process_Selected_Index == 2)
        {
            textBox2.Enabled = true;
            textBox3.Enabled = true;
            textBox4.Enabled = false;
            textBox5.Enabled = false;
            textBox6.Enabled = false;
            textBox7.Enabled = false;
            textBox8.Enabled = false;
            textBox9.Enabled = false;
            textBox10.Enabled = false;
            textBox11.Enabled = false;
            textBox12.Enabled = false;
            textBox13.Enabled = false;
        }
        if (Combobox_Process_Selected_Index == 3)
        {
            textBox2.Enabled = true;
            textBox3.Enabled = true;
            textBox4.Enabled = true;
            textBox5.Enabled = false;
            textBox6.Enabled = false;
            textBox7.Enabled = false;
            textBox8.Enabled = false;
            textBox9.Enabled = false;
            textBox10.Enabled = false;
            textBox11.Enabled = false;
            textBox12.Enabled = false;
            textBox13.Enabled = false;
        }
        if (Combobox_Process_Selected_Index == 4)
        {
            textBox2.Enabled = true;
            textBox3.Enabled = true;
            textBox4.Enabled = true;
            textBox5.Enabled = true;
            textBox6.Enabled = false;
            textBox7.Enabled = false;
            textBox8.Enabled = false;
            textBox9.Enabled = false;
            textBox10.Enabled = false;
            textBox11.Enabled = false;
            textBox12.Enabled = false;
            textBox13.Enabled = false;
        }
        if (Combobox_Process_Selected_Index == 5)
        {
            textBox2.Enabled = true;
            textBox3.Enabled = true;
            textBox4.Enabled = true;
            textBox5.Enabled = true;
            textBox6.Enabled = true;
            textBox7.Enabled = false;
            textBox8.Enabled = false;
            textBox9.Enabled = false;
            textBox10.Enabled = false;
            textBox11.Enabled = false;
            textBox12.Enabled = false;
            textBox13.Enabled = false;
        }
        if (Combobox_Process_Selected_Index == 6)
        {
            textBox2.Enabled = true;
            textBox3.Enabled = true;
            textBox4.Enabled = true;
            textBox5.Enabled = true;
            textBox6.Enabled = true;
            textBox7.Enabled = true;
            textBox8.Enabled = false;
            textBox9.Enabled = false;
            textBox10.Enabled = false;
            textBox11.Enabled = false;
            textBox12.Enabled = false;
            textBox13.Enabled = false;
        }
        if (Combobox_Process_Selected_Index == 7)
        {
            textBox2.Enabled = true;
            textBox3.Enabled = true;
            textBox4.Enabled = true;
            textBox5.Enabled = true;
            textBox6.Enabled = true;
            textBox7.Enabled = true;
            textBox8.Enabled = true;
            textBox9.Enabled = false;
            textBox10.Enabled = false;
            textBox11.Enabled = false;
            textBox12.Enabled = false;
            textBox13.Enabled = false;
        }
        if (Combobox_Process_Selected_Index == 8)
        {
            textBox2.Enabled = true;
            textBox3.Enabled = true;
            textBox4.Enabled = true;
            textBox5.Enabled = true;
            textBox6.Enabled = true;
            textBox7.Enabled = true;
            textBox8.Enabled = true;
            textBox9.Enabled = true;
            textBox10.Enabled = false;
            textBox11.Enabled = false;
            textBox12.Enabled = false;
            textBox13.Enabled = false;
        }
        if (Combobox_Process_Selected_Index == 9)
        {
            textBox2.Enabled = true;
            textBox3.Enabled = true;
            textBox4.Enabled = true;
            textBox5.Enabled = true;
            textBox6.Enabled = true;
            textBox7.Enabled = true;
            textBox8.Enabled = true;
            textBox9.Enabled = true;
            textBox10.Enabled = true;
            textBox11.Enabled = false;
            textBox12.Enabled = false;
            textBox13.Enabled = false;
        }
        if (Combobox_Process_Selected_Index == 10)
        {
            textBox2.Enabled = true;
            textBox3.Enabled = true;
            textBox4.Enabled = true;
            textBox5.Enabled = true;
            textBox6.Enabled = true;
            textBox7.Enabled = true;
            textBox8.Enabled = true;
            textBox9.Enabled = true;
            textBox10.Enabled = true;
            textBox11.Enabled = true;
            textBox12.Enabled = false;
            textBox13.Enabled = false;
        }
        if (Combobox_Process_Selected_Index == 11)
        {
            textBox2.Enabled = true;
            textBox3.Enabled = true;
            textBox4.Enabled = true;
            textBox5.Enabled = true;
            textBox6.Enabled = true;
            textBox7.Enabled = true;
            textBox8.Enabled = true;
            textBox9.Enabled = true;
            textBox10.Enabled = true;
            textBox11.Enabled = true;
            textBox12.Enabled = true;
            textBox13.Enabled = false;
        }
        if (Combobox_Process_Selected_Index == 12)
        {
            textBox2.Enabled = true;
            textBox3.Enabled = true;
            textBox4.Enabled = true;
            textBox5.Enabled = true;
            textBox6.Enabled = true;
            textBox7.Enabled = true;
            textBox8.Enabled = true;
            textBox9.Enabled = true;
            textBox10.Enabled = true;
            textBox11.Enabled = true;
            textBox12.Enabled = true;
            textBox13.Enabled = true;
        }

    }

Answer 1

Okay, I just have to say thank you very much h8red . I went from a massive amount of junk code to less than 10 lines of code.

Here is the resulting consolidation of code by placing the textboxes in a panel and then enabling/disabling them based on the combo box user input.

        private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
    {
        //set a counter to track textbox number and compare with combobox selection
        int countTB = 0;

        //grab combobox selection and place as an integer
        int Combobox_Process_Selected_Index = comboBox2.SelectedIndex;

        //this looks at each child control in my panel (named panel1)
        foreach (Control child in panel1.Controls)  
        {
            //this looks at each textbox individually and enables them until combo selection is reached and disables the rest
            TextBox textBox = child as TextBox;              
            if (countTB < Combobox_Process_Selected_Index)
            {
                textBox.Enabled = true;
            }
            else
                textBox.Enabled = false;
            countTB++;
        }
    }

Answer 2

You need a container control class to have all the textboxes in it. The simplest one is Panel class. Just add all the texboxes to panel.Controls and you will be able to access them in a loop. You will also have to manually set a tab in order to be able to enable only some of them.