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Referencing Variable in For Loop

Posted on 2010-11-29
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Last Modified: 2013-12-17
I am almost 100% sure this is possible but I can't seem to get it to work.

I have a for loop and I am trying to use the Loop iterator to reference the value in a text box.

I have 5 text boxes that I want to grab the text out of the box when the for loop increments.  i tried it with brackets around the variable but I get and error stating 'txtUnit1Tag' does not exist in the current context.  How can I reference the text box txtUnit1Tag1 using i ?


for(int i=1; i<5; i++)
{
   value = txtUnit1Tag[i].Text;              
}

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Question by:rkneal
7 Comments
 
LVL 33

Expert Comment

by:jppinto
ID: 34234941
Please try this...
for(int i=1; i<5; i++)
{
   value = FindControl("txtUnit1Tag" & i, Me).Text;              
}

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Expert Comment

by:Mike Tomlinson
ID: 34234953
WebForms or WinForms?
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Author Comment

by:rkneal
ID: 34235003
Windows Forms
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Author Comment

by:rkneal
ID: 34235043
jppinto - When i try that I get the name 'FindControl' doe snot exist in the current context, followed by Operator & cannot be applied to operands of type 'string and 'int'.
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LVL 86

Accepted Solution

by:
Mike Tomlinson earned 252 total points
ID: 34235050
For WinForms, try something like:
private void button1_Click(object sender, EventArgs e)
        {
            Control[] ctls;
            for (int i = 1; i < 5; i++)
            {
                ctls = this.Controls.Find("txtUnit1Tag" + i.ToString(), true);
                if (ctls.Length > 0 && ctls[0] is TextBox)
                {
                    TextBox tb = (TextBox)ctls[0];
                    MessageBox.Show(tb.Text, tb.Name, MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
            }
        }

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Assisted Solution

by:shadow77
shadow77 earned 248 total points
ID: 34236587
If you have a form named MainForm with five TextBoxes named textBox1 thru textBox5, this code will do what you want.

To create MainForm_Load, use the Properties window in the Forms Designer to add an event handler for Load (you can't just add the method; you need the triggering mechanism).  MainForm_Load may contain other code as well; this is just what you need to add.

Note that you cannot simply initialize the txtUnit[] array because the TextBoxes don't exist until after InitializeComponent() has been executed (you could also just put this code right after the call to InitializeComponent()).

You really only need the first seven lines.  Test39 just illustrates how to reference your TextBoxes.
TextBox[] txtUnit = new TextBox[5];       // an array that allows indexed access to a group of TextBoxes

    private void MainForm_Load(object sender, EventArgs e)
    {
        TextBox[] _txtUnit = { textBox1, textBox2, textBox3, textBox4, textBox5 };
        txtUnit = _txtUnit;
    }

    private void test39()
    {
        for (int i = 0; i < txtUnit.Length; ++i)
            txtUnit[i].Text = (i * i).ToString();
    }

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Author Closing Comment

by:rkneal
ID: 34239225
Used a combination of both your suggestions to accomplish my end result.  Thanks for your assistance.
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