--- title: "Calculator in ASP.Net without Javascript" description: "Code for the above design (Default.aspx)body formid=\"form1\"runat=\"server\" aspButtonID=\"btn2\"runat=\"server\"Height=\"30px\" stylez-index1left240pxtop" author: "Anonymous User" published: 2010-07-27 updated: 2020-03-04 canonical: https://www.mindstick.com/articles/39/calculator-in-asp-dot-net-without-javascript category: "asp.net" tags: ["asp.net"] reading_time: 3 minutes --- # Calculator in ASP.Net without Javascript ![Calculator in ASP.Net without Javascript](https://www.mindstick.com/mindstickarticle/e42c91da-26e1-4774-a6aa-f089341b1fb2/images/686d50fd-69ad-4daa-9fb5-7abdad81acc7.png) ##### Code for the above design (Default.aspx) ```

``` ##### C Sharp code for above design(Default.aspx.cs) ``` //declaring globalvalues //val for value Double val=0; enum operators { Add=1, Sub, Mul,Div, Equal }; //operator_clicked to checked last operator clicked. int operator_clicked = 0; //pressed to check for number button pressed Boolean pressed; //equal function which is used with every math operator void equal() { //initilizing value of viewstate in val to get the previous value of val //before clicking any button val = (double)ViewState["val"]; //fetching value of operator button last clicked in o int o = (int)ViewState["operator"]; //performing task according to the value of o switch (o) { case (int)operators.Add: val = (val + Convert.ToDouble(txtValue.Text)); break; case (int)operators.Sub: val = (val - double.Parse(txtValue.Text)); break; case (int)operators.Mul: val = (val * double.Parse(txtValue.Text)); break; case (int)operators.Div: val = (val / double.Parse(txtValue.Text)); break; default: if (txtValue.Text != "") val = Convert.ToDouble(txtValue.Text); else val = 0; break; } //assigning textbox text to the val computed above txtValue.Text = val.ToString(); //storing values in view state. ViewState["val"] = val; ViewState["dec_pressed"] = false; ViewState["pressed"] = false; } protected void Page_Load(object sender, EventArgs e) { //checking condition whether page is reloaded or not if not reloaded ie. If //it is loaded for the first time then the below statements will execute. if (!IsPostBack) { // val = 0; ViewState["val"] = val; ViewState["operator"] = 0; ViewState["pressed"] = false; ViewState["dec_pressed"] = false; txtValue.Text = "0"; } } //on number button click event this function will execute. protected void btn_Click(object sender, EventArgs e) { //checking whether number button is pressed first time after clicking any //operator or not pressed = (Boolean)ViewState["pressed"]; if (pressed==false) txtValue.Text = ""; ViewState["pressed"] = true; //concatinating text of button clicked to the text of text box. txtValue.Text += ((Button)sender).Text; } protected void btnAdd_Click(object sender, EventArgs e) { equal(); //setting operator clicked value to value of operators.add ie.1 and storing //in viewstate for further use. operator_clicked = (int)operators.Add; ViewState["operator"] = operator_clicked; } protected void btnSub_Click(object sender, EventArgs e) { equal(); operator_clicked = (int)operators.Sub; ViewState["operator"] = operator_clicked; } protected void btnMul_Click(object sender, EventArgs e) { equal(); operator_clicked = (int)operators.Mul; ViewState["operator"] = operator_clicked; } protected void btnDiv_Click(object sender, EventArgs e) { equal(); operator_clicked = (int)operators.Div; ViewState["operator"] = operator_clicked; } protected void btnEqual_Click(object sender, EventArgs e) { equal(); //setting value of val to 0 and storing in viewstate and operator_clicked //value to value of equal ie. 5 val = 0; ViewState["val"] = val; operator_clicked = (int)operators.Equal; ViewState["operator"] = operator_clicked; } //this will clear text box and assign initial values to viewstate. protected void btnClear_Click(object sender, EventArgs e) { txtValue.Text = ""; ViewState["val"] = 0; ViewState["operator"]= 0; ViewState["pressed"]= false; ViewState["dec_pressed"]= false; } protected void btnClose_Click(object sender, EventArgs e) { //java script is used to close window. Response.Write(""); } //put decimal point in text box if it does not contain any. protected void btnDec_Click(object sender, EventArgs e) { pressed = (Boolean)ViewState["pressed"]; if (pressed == false) txtValue.Text= ""; //checking whether decimal is ther in text box or not. if ((bool)ViewState["dec_pressed"] == false) { if (txtValue.Text == "") txtValue.Text = "0."; else txtValue.Text += "."; } //setting deciaml pressed view satate and number pressed view state to true. ViewState["dec_pressed"] = true; ViewState["pressed"] = true; } ``` Snap shot ![Calculator in ASP.Net without Javascript](https://www.mindstick.com/mindstickarticle/e42c91da-26e1-4774-a6aa-f089341b1fb2/images/1c18e4ed-4a03-487d-aca3-5c5dc7cd2956.png) --- Original Source: https://www.mindstick.com/articles/39/calculator-in-asp-dot-net-without-javascript Copyright © MindStick Software Pvt. Ltd. This Markdown version is provided for developers, AI systems, and offline reading.