How to call code behind function from web page using javascrip , ajax

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i have written a function function , that i want to call using javascript, ajax.

What I have tried:

web page code

HTML

<script type = "text/JavaScript">
       
             function statebind() {
                  $.ajax({
                     type: "POST",
                     url: "TestAjax.aspx.cs/bindstate",
                     data: JSON.stringify({ username: $('#ddlCountry').val() }),
                     contentType: "application/json; charset=utf-8",
                     dataType: "json",
                     success: function (data) 
                     {
                         if (data) 
                        {
                            toastr.success('Congratulations! Username is available.');
                        }
                        else 
                        {
                            toastr.error('Please choose another Username!');  
                            $('#txtUsername').focus();
                        }
                   },
                    error: function (data) 
                   {
                   }
                 });
              }
  </script>

C# code

C#

[System.Web.Services.WebMethod]
       public static void bindstate(string id)
       {
           try
           {
               OracleDataReader dr;
               string connectionString = ConfigurationManager.AppSettings["ConnectionString"];
               OracleConnection conn = new OracleConnection(connectionString);
               conn.Open();
               String Str = "select STATE_ID,STATE_NAME from com_state_master where COUNTRY_ID="+id;
               OracleCommand cmd = new OracleCommand(Str, conn);
               dr = cmd.ExecuteReader();
               conn.Close();
           }
           finally
           {
           }
       }


   }

Posted 15-Nov-16 18:22pm

manish-gusain8909

Updated 18-Nov-16 17:42pm

v2

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Comments

StM0n 16-Nov-16 0:38am

Are you aware that you open your site for sql injection? the parameter <id> is a plain string, that just get concatenated to a statement.

2 solutions

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Karthik_Mahalingam · Answer 1 · 2016-11-15T19:32:00

Solution 2

make it as static method and add WebMethod Attribute to it.

C#

[WebMethod]
public  static void bindstate(string id)
{
}

your code is vulnerable to Sql injection[^] attack, always use Parameterised query to avoid sql injection attacks[^]

Posted 15-Nov-16 19:32pm

Karthik_Mahalingam

Tausif/Pintu · Answer 2 · 2016-11-15T19:23:00

Just declare your bindstate() method as a WebMethod like

C#

[System.Web.Services.WebMethod]
public  void bindstate(string id)
        {
            try
            {
                string connectionString = ConfigurationManager.AppSettings["ConnectionString"];
                OracleConnection conn = new OracleConnection(connectionString);
                conn.Open();
                String Str = "select STATE_ID,STATE_NAME from com_state_master where COUNTRY_ID="+id;
                OracleCommand cmd = new OracleCommand(Str, conn);
                ddlState.DataSource = cmd.ExecuteReader();
                ddlState.DataTextField = "COUNTRY_NAME";
                ddlState.DataValueField = "COUNTRY_ID";
                ddlState.DataBind();
                conn.Close();
            }
            finally
            {
            }
        }