pass value to web method

Question

 i want to pass checkbox value to string res when checkbox is checked.

 

 

[System.Web.Script.Services.ScriptMethod()]

[System.Web.Services.WebMethod]

public static List<string> GetSearch(string prefixText,string res)

{

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);

SqlDataAdapter da;

DataTable dt;

DataTable Result = new DataTable();

string str = "Select distinct ITEMNAME from ALLRECIPE where RECIPE IN("+res+") and ITEMNAME like '%" + prefixText + "%'";

da = new SqlDataAdapter(str, con);

dt = new DataTable();

da.Fill(dt);

List<string> Output = new List<string>();

for (int i = 0; i < dt.Rows.Count; i++)

Output.Add(dt.Rows[i][0].ToString());

return Output;

}