c# - how to add arguments to button click that will only change part of cmd -

i'm trying build first c# program , got stuck @ changing part of button click arguments.

i need ssid , key able changed:

strcmdtext = "/c netsh wlan set hostednetwork mode=allow ssid=changeme key=changeme keyusage=persistent & netsh wlan start hostednetwork"; 

here code:

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.windows.forms; using system.diagnostics;    namespace wifion {     public partial class form1 : form     {         public form1()         {             initializecomponent();         }          private void button1_click(object sender, eventargs e)         {              string strcmdtext;             strcmdtext = "/c netsh wlan set hostednetwork mode=allow ssid=changeme key=123123123 keyusage=persistent & netsh wlan start hostednetwork";             system.diagnostics.process.start("cmd.exe", strcmdtext);         }          private void button2_click(object sender, eventargs e)         {             string strcmdtext;             strcmdtext = "/c netsh wlan stop hostednetwork";             system.diagnostics.process.start("cmd.exe", strcmdtext);         }          private void picturebox1_click(object sender, eventargs e)         {             messagebox.show("wifigo 1.0.\nwritten by: atilla eyice", "about");         }          private void textbox1_textchanged(object sender, eventargs e)         {          }          private void combobox1_selectedindexchanged(object sender, eventargs e)         {          }     } } 

string ssid = this.textbox1.text; string key = this.textbox2.text;  strcmdtext = string.format("/c netsh wlan set hostednetwork mode=allow ssid={0} key={1} keyusage=persistent & netsh wlan start hostednetwork", ssid, key);