//Method to update data 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(myconnstring); try { //Sql to update data in our Database string sql = "UPDATE tbl_contact SET FirstName=@FirstName, LastName=@LastName, ContactNo=@ContactNo, Address=@Address, Gender=@Gender WHERE ContactID=@ContactID"; //Creating Sql Command SqlCommand cmd = new SqlCommand(sql, conn); //Creating Parameterss 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 succefully then 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); }
//Inserting Data into Database public bool Insert(ContactClass 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 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.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 else its value will 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 Delete(ContactClass c) { //Create a default 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 tbl_contact 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 runs successfully then 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 { //Close Connection conn.Close(); } return(isSuccess); }