c# - Why string type is not converting to int type? -

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i want add 2 numbers. getting values button in textbox. succeeded in splitting string substrings , store values of these substrings in variables. not able convert string type integer type. results in concatenation not in addtion. note : using mvc perform task. , in model value1 , value2 string type in model here code snippet:

if (button == "1"){     if (model.textbox == "" || model.textbox == null || model.textbox.tolower().contains("please enter value")){         model.textbox = "1";     } else {         model.textbox += "1";     } } if (button == "2") {     if (model.textbox == "" && model.textbox == null) {         model.textbox = "2";     } else {         model.textbox += "2";     } if (button == "+") {     if (model.textbox == "" && model.textbox == null){         model.errormsg = "please enter number ";     } else {         model.textbox += "+";     } if (button == "=") {     if (model.textbox.contains("+")) {         model.value1 = (model.textbox.split('+'))[0];         int value1 = int.parse(model.value1);         model.value2 = (model.textbox.split('+'))[1];         int value2 = int.parse(model.value2);          model.textbox = model.value1 + model.value2;     } return view(model);

if got correctly need is:

model.textbox = (value1 + value2).tostring();

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