Receiving data from variable from another form. [* Resovled *]

Hello,

I have 2 forms. One is called librarySettings, and another one is called loanBook. When the user wants to loan a book, l want to be able to receive 2 variables from this form, which is DaysBorrowed, and OverdueFine. This way if the settings are changed then the loanbook form will have the updated variables.

This is what l have done, and l have done this before, but can't seen to get it to work. Don't know what is going on here.

LibrarySettings form.

Code:

---

This load the variables data from a database, so that the settings can be updated to a database.
private void frmLibrarySettings_Load(object sender, System.EventArgs e)
                {
                        try
                        {
                                cnn.Open();

                                OleDbCommand cmd = cnn.CreateCommand();
                                OleDbDataAdapter da = new OleDbDataAdapter();
                                DataTable dt = new DataTable();

                                cmd.CommandType = CommandType.Text;
                                cmd.CommandText = "SELECT * FROM LibrarySettings";
                               
                                da.SelectCommand = cmd;
                                da.Fill(dt);

                                upDDays.Value = Convert.ToInt16(dt.Rows[0]["Days"]); //load into a numericUpDown control
                                upDFine.Value = Convert.ToInt16(dt.Rows[0]["Fine"]);
                        }
                        catch ( OleDbException ex )
                        {
                                MessageBox.Show(ex.Message);
                        }
                        catch ( Exception ex )
                        {
                                MessageBox.Show(ex.Message);
                        }
                }

---

//Set up 2 public procedures

Code:

---

                public int fineAmount
                {
                        get
                        {
                                return Convert.ToInt16(upDFine.Value);
                        }
                }

                public int DaysToBorrow
                {
                        get
                        {
                                return Convert.ToInt16(upDDays.Value);
                        }
                }

---

That is all for the library settings form


for the loanbook form.

I have declared this in the form at the top of the class

Code:

---

frmLibrarySettings getLibraryDetails = null; //Finds the day and fine amount that has been set in the library settings form

---

Find out how long the book can be loaned for.

Code:

---

int loanDays = 0;
loanDays = getLibraryDetails.DaysToBorrow; //Get the days the book can be loaned for - error occurs here

---

The error message l get when this code is executed is " Object reference not set to an instance of an object."

Not sure what l am doing wrong. Hope someone can help

Thanks in advance,

Steve

Code:

---

frmLibrarySettings getLibraryDetails = null; //Finds the day and fine amount that has been set in the library settings form

---

Why are you setting it to null?

It did not work when it was NULL, so l set it to null. I thought that maybe that was the problem.

Do you have any other ideas

Thanks for you reply,

Steve

Code:

---

frmLibrarySettings getLibraryDetails = new frmLibrarySettings();

---

Thanks for you help, it worked