c# - Array IndexOutOfRange -

        string temp = textbox1.text;         char[] array1 = temp.tochararray();         string temp2 = "" + array1[0];         string temp3 = "" + array1[1];         string temp4 = "" + array1[2];         textbox2.text = temp2;         textbox3.text = temp3;         textbox4.text = temp4; 

how prevent indexoutofrange error occurring when user inputs less 3 letters in textbox1?

how prevent indexoutofrange error if user input less 3 letters in textbox1?

just check using temp.length:

if (temp.length > 0) {     ... } 

... or use switch/case.

also, don't need array @ all. call tostring on each character, or use substring:

string temp = textbox1.text; switch (temp.length) {     case 0:         textbox2.text = "";         textbox3.text = "";         textbox4.text = "";         break;     case 1:         // via indexer...         textbox2.text = temp[0].tostring();         textbox3.text = "";         textbox4.text = "";         break;     case 2:         // via substring         textbox2.text = temp.substring(0, 1);         textbox3.text = temp.substring(1, 1);         textbox4.text = "";         break;     default:         textbox2.text = temp.substring(0, 1);         textbox3.text = temp.substring(1, 1);         textbox4.text = temp.substring(2, 1);         break; } 

another option - neater - use conditional operator:

string temp = textbox1.text; textbox2.text = temp.length < 1 ? "" : temp.substring(0, 1); textbox3.text = temp.length < 2 ? "" : temp.substring(1, 1); textbox4.text = temp.length < 3 ? "" : temp.substring(2, 1);