executing stored procedure in c# bot application error

Question

 

 

public async Task<DataTable> MessageReceivedNearestMuseums(string lat, string lng)

{

SqlConnection cnn = new SqlConnection("Data Source=CHRISTOS\\SQLEXPRESS;Initial Catalog=GuideDB;Integrated Security=True");

SqlCommand cmd = new SqlCommand();

SqlDataAdapter da = new SqlDataAdapter();

DataTable dt = new DataTable();

cnn.Open();

cmd = new SqlCommand("get_nearest_Restaurants", cnn);

cmd.Parameters.Add(new SqlParameter("@lat", lat));

cmd.Parameters.Add(new SqlParameter("@lng", lng));

cmd.CommandType = CommandType.StoredProcedure;

da.SelectCommand = cmd;

SqlDataReader dr = cmd.ExecuteReader();

while (dr.Read())

{

String mes = "Nearest Museum ID: " + dr[1].ToString() + "\nName:" + dr[2].ToString() + "\nCity: " + dr[3].ToString() + "\nLocation: " + dr[4].ToString();

await context.PostAsync(mes);

}

dr.Read();

cnn.Close();

context.Wait(MessageReceivedNearestMuseums);