//Method to delete data from database
public bool Delete(ContactClass cc)
{
//Creating a default return type and initializing it to false
bool IsSuccess = false;
//Step 1: Database Connection
SqlConnection Conn = new SqlConnection(MyConnString);
try
{
//Writing sql query
string Sql = "DELETE FROM Contacts WHERE Contact_ID=@ContactID";
//Creating cmd using Sql and Conn
SqlCommand SqlCmd = new SqlCommand(Sql, Conn);
SqlCmd.Parameters.AddWithValue("@ContactID", cc.ContactID);
//Opening Connection
Conn.Open();
int Rows = SqlCmd.ExecuteNonQuery();
//if query runs successfully value of rows will be greater than 0 else less than 0
if (Rows > 0)
{
IsSuccess = true;
}
else
{
IsSuccess = false;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Exception", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
finally
{
//Closing connection
Conn.Close();
}
return(IsSuccess);
}
//Method to update data in Database
public bool Update(ContactClass cc)
{
//Creating a default return type and initializing it to false
bool IsSuccess = false;
//Step 1: Database Connection
SqlConnection Conn = new SqlConnection(MyConnString);
try
{
//Writing sql query
string Sql = "UPDATE Contacts SET First_Name=@FirstName, Last_Name=@LastName, Email_Id=@EmailId, Contact_No=@ContactNo, Address=@Address, Gender=@Gender WHERE Contact_ID=@ContactID";
//Creating cmd using Sql and Conn
SqlCommand SqlCmd = new SqlCommand(Sql, Conn);
//Create Parameters to add data
SqlCmd.Parameters.AddWithValue("@FirstName", cc.FirstName);
SqlCmd.Parameters.AddWithValue("@LastName", cc.LastName);
SqlCmd.Parameters.AddWithValue("@EmailId", cc.EmailId);
SqlCmd.Parameters.AddWithValue("@ContactNo", cc.ContactNo);
SqlCmd.Parameters.AddWithValue("@Address", cc.Address);
SqlCmd.Parameters.AddWithValue("@Gender", cc.Gender);
SqlCmd.Parameters.AddWithValue("@ContactID", cc.ContactID);
//Opening Connection
Conn.Open();
if (cc.FirstName == "" || cc.LastName == "" || cc.EmailId == "" || cc.ContactNo == "" || cc.Address == "" || cc.Gender == "")
{
MessageBox.Show("Please fill all the fields to add new contact", "Empty Fields Detected", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else if (!ValidateEmail())
{
MessageBox.Show("Enter a valid email address", "Invalid email address", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else
{
int Rows = SqlCmd.ExecuteNonQuery();
//if query runs successfully value of rows will be greater than 0 else less than 0
if (Rows > 0)
{
IsSuccess = true;
}
else
{
IsSuccess = false;
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Exception", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
finally
{
//Closing connection
Conn.Close();
}
return(IsSuccess);
}
