Question

This should work.. I think..

string ctrlName = "btnSomeButton" + someIndexValue;
this.Controls[ctrlName].Text = "Some value";

I get ‘Object reference not set to an instance of an object.’, the control does exist on the form. I’ve tried casting it.

Solution:

string ctrlName = "btnSomeButton" + someIndexValue;
Control[] ctrl = this.Controls.Find(ctrlName, True);
Button btn = (Button)ctrl[0];
btn.Text = "Some Value";

Thank you.

Answer 1

The control might be a nested control so you’re going to have to dig deeper in the control tree of “this”

Here is a simple recursive control search tool, i wrote it without testing it but i think it should work for your needs:

private Control FindControl(Control ctr, string name)
{
    Control c = null;
    for (int i = 0; i < ctr.Controls.Count; i++)
    {
        if (string.Equals(ctr.Controls[i].ID, name, StringComparison.CurrentCultureIgnoreCase))
        {
            c = ctr.Controls[i];
            break;
        }
        if (ctr.Controls[i].Controls.Count > 0)
        {
            c = FindControl(ctr.Controls[i], name);
            if (c != null)
                break;
        }
    }

    return c;
}