ماهو الخطا فى الاستعلام الى فى الكود التالى
SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["cstr"].ConnectionString);
SqlCommand cmd = new SqlCommand("select * from Donators where (DonatorName like '% @DonatorName %') ", cn);
cmd.Parameters.AddWithValue("@DonatorName", sarch_txt.Text);
cn.Open();
SqlDataReader dr = cmd.ExecuteReader() ;
DataTable dt = new DataTable();
dt.Load(dr);
GridView1.DataSource = dt;
GridView1.DataBind();