//Inserting data into Database public bool Insert(classContact c) { //Creating a default return type and setting its value 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 tblContact(FirstName, LastName, ContactNo, Address, Gender) VALUES(@FirstName, @LastName, @ContactNo, @Address, @Gender)"; //creating sql command using sql and conn SqlCommand cmd = new SqlCommand(sql, conn); //Creatig parameters 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); //Connection open here conn.Open(); int rows = cmd.ExecuteNonQuery(); //if the query runs successfully then the value of rows will be greater than zero its value will be 0 if (rows > 0) { isSuccess = true; } else { isSuccess = false; } } catch (Exception ex) { } finally { conn.Close(); } return(isSuccess); }
//Method to update data in database from our application public bool Update(classContact 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 tblContact SET FirstName=@FirstName, LastName=@LastName, ContactNo=@ContactNo, Address=@Address, Gender=@Gender WHERE ContactID=@ContactID"; //Creating sql command 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.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 runs sucessfully then the value of rows will be greater than zero else its value will be zero if (rows > 0) { isSuccess = true; } else { isSuccess = false; } } catch (Exception ex) { } finally { conn.Close(); } return(isSuccess); }
//Method to Delete Data from Database public bool Delte(classContact c) { //Create a default return value and set its value to false bool isSuccess = false; //Create SQL connection SqlConnection conn = new SqlConnection(myconnstring); try { //sql to delete data string sql = "DELETE FROM tblContact WHERE ContactId=@ContactID"; //creating sql command SqlCommand cmd = new SqlCommand(sql, conn); cmd.Parameters.AddWithValue("ContactID", c.ContactID); //open connection conn.Open(); int rows = cmd.ExecuteNonQuery(); //If the query run sucessfully then the value od rows is the greather than zero else its value is 0 if (rows > 0) { isSuccess = true; } else { isSuccess = false; } } catch (Exception ex) { } finally { //Close connection conn.Close(); } return(isSuccess); }