Question

I have controls that are named in numeric sequence.
I’d like to assign values those controls using loop.
The code below is the way i’m currently using.

txtSalesInvoiceForm_Qty1.Text = (salesInvoice.ItemQty1 == 0) ? string.Empty : salesInvoice.ItemQty1.ToString();
txtSalesInvoiceForm_Qty2.Text = (salesInvoice.ItemQty2 == 0) ? string.Empty : salesInvoice.ItemQty2.ToString();
txtSalesInvoiceForm_Qty3.Text = (salesInvoice.ItemQty3 == 0) ? string.Empty : salesInvoice.ItemQty3.ToString();
txtSalesInvoiceForm_Qty4.Text = (salesInvoice.ItemQty4 == 0) ? string.Empty : salesInvoice.ItemQty4.ToString();
txtSalesInvoiceForm_Qty5.Text = (salesInvoice.ItemQty5 == 0) ? string.Empty : salesInvoice.ItemQty5.ToString();
txtSalesInvoiceForm_Unit1.Text = salesInvoice.Unit1;
txtSalesInvoiceForm_Unit2.Text = salesInvoice.Unit2;
txtSalesInvoiceForm_Unit3.Text = salesInvoice.Unit3;
txtSalesInvoiceForm_Unit4.Text = salesInvoice.Unit4;
txtSalesInvoiceForm_Unit5.Text = salesInvoice.Unit5;
txtSalesInvoiceForm_Particulars1.Text = salesInvoice.Particulars1;
txtSalesInvoiceForm_Particulars2.Text = salesInvoice.Particulars2;
txtSalesInvoiceForm_Particulars3.Text = salesInvoice.Particulars3;
txtSalesInvoiceForm_Particulars4.Text = salesInvoice.Particulars4;
txtSalesInvoiceForm_Particulars5.Text = salesInvoice.Particulars5;

Is there any way something like this?

int index = 1;
foreach (SalesInvoiceItem item in salesInvoice.SalesInvoiceItems)
{
    (txtSalesInvoiceForm_Qty + index.ToString()).Text = Value;
    indexer++                        
}

Answer 1

Control parent = this.pnlParent; // this must be the immediate parent control

int index = 1;
foreach (SalesInvoiceItem item in salesInvoice.SalesInvoiceItems)
{
    TextBox tb = parent.FindControl( "txtSalesInvoiceForm_Qty" + index++ ) as TextBox;
    tb.Text = Value;       
}

The key is FindControl(), which searches the immediate children of a parent. Personally I think this is sloppy code in most cases.