//Inserting Data into Database public bool Insert(econtactClass 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 SQL Query string sql = "INSERT INTO tbl_contact(FirstName, LastName, ContactNo, Address, Gender) VALUES(@FirstName, @LastName, @ContactNo, @Address, @Gender)"; //Creating cmd using sql and conn SqlCommand cmd = new SqlCommand(sql, conn); //Create 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 row = cmd.ExecuteNonQuery(); //if the query runs successfully, the value of rows will be greater than zero if (row > 0) { isSuccess = true; } else { isSuccess = false; } } catch (Exception ex) { } finally { conn.Close(); } return(isSuccess); }
//Method to update data in database from application public bool update(econtactClass c) { //Create a default retuen type and set default 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); //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 Delete(econtactClass c) { //Create a default retuen type and set default to false bool isSuccess = false; SqlConnection conn = new SqlConnection(myconnstring); try { //SQL To Delte 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 run sucessfully then the value of rows is greater 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); }