full post back occurs

The link I gave uses normal ASPX page and not a web service. Please read article properly

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();
                        }}


}
}

Use the following GetType method

[System.Web.Services.WebMethod]
       public static string 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();
                        }}

ScriptManager.RegisterClientScriptBlock(this, typeof(System.Web.UI.Page), "settype", "settype();", true);


                BindGrid();//function for binding grid
}
}

initated settype function from code

but

if  i use static  i get

Error    1    An object reference is required for the nonstatic field, method, or property

if i remove static i get error

Message: 'PageMethods' is undefined

 if i hardcode a value i get it

public static string Gettype(string type)
       {
         return "N";

  //return "Hello " + H_TYPE.Value;


       }

Yes you cannot use Non static fields or variables in static method

1. Either make them static

2. OR create a new object inside static function