//Method to update data in database from our app public bool Update(ContactClass c) { //create a default return type and set its default value to false bool isSuccess = false; SqlConnection conn = new SqlConnection(myconnstring); try { //sql to update data in our database string sql = "UPDATE Econtact SET FirstName=@FirstName, LastName=@LastName, ContactNo=@ContactNo, Address=@Address, Gender=@Gender WHERE ContactID=@ContactID"; //create sql commend SqlCommand cmd = new SqlCommand(sql, conn); //create parameters to add values cmd.Parameters.AddWithValue("@FirstName", c.FirstName); cmd.Parameters.AddWithValue("@LastName", c.LastName); cmd.Parameters.AddWithValue("@ContactNo", c.ContactNo); cmd.Parameters.AddWithValue("@Address", c.Address); cmd.Parameters.AddWithValue("@Gender", c.Gender); cmd.Parameters.AddWithValue("@ContactID", c.ContactID); //open database connection conn.Open(); int rows = cmd.ExecuteNonQuery(); //if the query rund successfylly then the value of rows will be grater than zero else values will be 0 if (rows > 0) { isSuccess = true; } else { isSuccess = false; } } catch (Exception ex) { } finally { conn.Close(); } return(isSuccess); }
// Insert Data into database public bool Insert(ContactClass c) { //creating default return type and setting its values to false bool isSuccess = false; //step 1: connect Database SqlConnection conn = new SqlConnection(myconnstring); try { //Step 2: create a sql query to insert data string sql = "INSERT INTO Econtact (FirstName, LastName, ContactNo, Address, Gender) VALUES (@FirstName, @LastName, @ContactNo, @Address, @Gender)"; //creating sql commend using sql and conn SqlCommand cmd = new SqlCommand(sql, conn); //Creat parameter to add data cmd.Parameters.AddWithValue("@FirstName", c.FirstName); cmd.Parameters.AddWithValue("@LastName", c.LastName); cmd.Parameters.AddWithValue("@ContactNo", c.ContactNo); cmd.Parameters.AddWithValue("@Address", c.Address); cmd.Parameters.AddWithValue("@Gender", c.Gender); //open connection here conn.Open(); int rows = cmd.ExecuteNonQuery(); //if the query successfully then value of rows will be generate than zero else its value will be 0 if (rows > 0) { isSuccess = true; } else { isSuccess = false; } } catch (Exception ex) { } finally { conn.Close(); } return(isSuccess); }
//method to delete data from database public bool Delete(ContactClass c) { //create a default values and set its values to false bool isSuccess = false; //create sql connection SqlConnection conn = new SqlConnection(myconnstring); try { //sql to delete data string sql = "DELETE FROM Econtact WHERE ContactID=@ContactID"; //create sql commend SqlCommand cmd = new SqlCommand(sql, conn); cmd.Parameters.AddWithValue("@ContactId", c.ContactID); //open connection conn.Open(); int rows = cmd.ExecuteNonQuery(); //if the query rund successfylly then the value of rows will be grater than zero else values will be 0 if (rows > 0) { isSuccess = true; } else { isSuccess = false; } } catch (Exception ex) { } finally { //cloase connection conn.Close(); } return(isSuccess); }