full post back occurs

Error    1    The type or namespace name 'publicstaticstring' could not be found (are you missing a using directive or an assembly

code

========

<script type="text/javascript">
function settype()
 {
PageMethods.Gettype(document.getElementById("<%=H_TYPE.ClientID%>").value, OnSuccess);
}
function OnSuccess(response, userContext, methodName)

 {
alert(response);
if(H_TYPE.value=="N")
{
    document.getElementById("control1").style.visibility=true;
}
else if(H_TYPE.value=="T")
{
    document.getElementById("control2").style.visibility=true;
}


}
</script>

 [System.Web.Services.WebMethod]
        publicstaticstring Gettype(string type)
        {
            return "Hello " + H_TYPE.Value;
        }

 protected void posyback_Click(object sender, EventArgs e)
        {
           
            try
            {
 	

                Qry = " SELECT FTYPE FROM STATUS,";
              
                SqlCommand cmd = new SqlCommand(Qry, con);
                SqlDataReader reader = cmd.ExecuteReader();

                if (reader.HasRows)
                {
                    while (reader.Read())
                    {

                        H_TYPE.Value = reader["FTYPE"].ToString();
                        }}


}
}