//method to update in database from our application public bool Update(ContactClass c) { //create a default return type and set its default value to false bool isSuccess = false; SqlConnection conn = new SqlConnection(myconnstrng); try { //sql to update in our database string sql = "UPDATE tbl_contact SET FirstName=@FirstName, LastName=@LastName, ContactNo=@ContactNo, Address=@Address, Gender=@Gender WHERE ContactID=@ContactID"; //create sql commande SqlCommand cmd = new SqlCommand(sql, conn); //create parameters to add value cmd.Parameters.AddWithValue("@FirstName", c.FirstName); cmd.Parameters.AddWithValue("@LastName", c.LastName); cmd.Parameters.AddWithValue("@ContactNo", c.ConstactNo); cmd.Parameters.AddWithValue("@Address", c.Address); cmd.Parameters.AddWithValue("@Gender", c.Gender); cmd.Parameters.AddWithValue("ContactID", c.ContactID); //oen database connection conn.Open(); int rows = cmd.ExecuteNonQuery(); //if the query runs succesfuly then the value will be grearer than zero else its value will be 0 if (rows > 0) { isSuccess = true; } else { isSuccess = false; } } catch (Exception e) { } finally { conn.Close(); } return(isSuccess); }
//inserting data into database public bool Insert(ContactClass c) { //creating a default type and setting its value to false bool isSuccess = false; //step 1 connect database SqlConnection conn = new SqlConnection(myconnstrng); try { //step 2 create a slq query to insert data string sql = "INSERT INTO tbl_contact (FirstName, LastName, ContactNo, Address, Gender) VALUES (@FirstName, @LastName, @ContactNo, @Address, @Gender)"; //creating sql command using sql and conn SqlCommand cmd = new SqlCommand(sql, conn); //creating parameters to add data cmd.Parameters.AddWithValue("@FirstName", c.FirstName); cmd.Parameters.AddWithValue("@LastName", c.LastName); cmd.Parameters.AddWithValue("@ContactNo", c.ConstactNo); cmd.Parameters.AddWithValue("@Address", c.Address); cmd.Parameters.AddWithValue("@Gender", c.Gender); //conection open here conn.Open(); int rows = cmd.ExecuteNonQuery(); //if the query runs succesfuly then the value of rows will be generate than zero else its value will be 0 if (rows > 0) { isSuccess = true; } else { isSuccess = false; } } catch (Exception e) { } finally { conn.Close(); } return(isSuccess); }