C# WMI query to string

Question

I would like to output results from a WMI query to a textbox or label in C#.

But I get a System.FormatException, when I try to put result into a textbox.text.

Here is my code:

using System;
using System.Windows.Forms;
using System.Management;

ManagementScope scope = new ManagementScope();

scope = new ManagementScope(@"\\localhost\root\CIMV2");
scope.Connect();

SelectQuery query = new SelectQuery("SELECT * FROM Win32_OperatingSystem");
ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query);
            
using (ManagementObjectCollection queryCollection = searcher.Get())
{
    foreach (ManagementObject m in queryCollection)
    {
         //this line produces the System.FormatException:
         textBox.Text = string.Format("Computer Name: { 0}", m["csname"]);
     }
} 

Answer 1

The problem with your format string is that you have a space before the 0 in the placeholder: { 0}. To fix the error, simply remove the space:

textBox.Text = string.Format("Computer Name: {0}", m["csname"]);

You could also simplify the code a little and use string interpolation (a C# 6 feature):

textBox.Text = $"Computer Name: {m["csname"]}";