MY CODE WORK ON GET METHOD BUT POST NOT WORK IN MVC5

$.ajax({
    type: "POST",
    url: "http://localhost:49290/api/admin/adminlogin",
    data: JSON.stringify(data),
    contentType: "application/json; charset=utf-8",
    dataType: "json",
 
    success: function (response) {
 
        var data = JSON.parse(response.d);
        var userid=data[0].userid;
        if (data.length > 0) {
            location.href = "Dashboard.aspx?userid='" + userid + "'";
        }
        else {
            $.iaoAlert({
                msg: "Username and Password Not Match...",
                type: "error",
                mode: "dark",
            })
            this1.disabled = false;
            this1.innerHTML = 'SIGN-IN';
        }
 
    },
    failure: function (response) {
        $.iaoAlert({
            msg: "404 Error",
            type: "error",
            mode: "dark",
        })
        this1.disabled = false;
        this1.innerHTML = 'SIGN-IN';
    },
    error: function (response) {
        $.iaoAlert({
            msg: "406 Error",
            type: "error",
            mode: "dark",
        })
        this1.disabled = false;
        this1.innerHTML = 'SIGN-IN';
    },
});
return false;

[HttpPost]
[Route("api/admin/adminlogin")]
public IHttpActionResult adminlogin(string CusName)
{ 
    return Ok("Find");
}