private void lnkExpenses_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
 {
     this.Hide();
     Expenses.ExpensesList go = new Expenses.ExpensesList();
     go.MdiParent = this.ParentForm;
     go.Show();
 }
        private void btnaddexpense_Click(object sender, EventArgs e)
        {
            try
            {
                if (txtAmount.Text == string.Empty)
                {
                    MessageBox.Show("Please Insert Expense Amount");
                    txtAmount.Focus();
                }
                else if (cmboCategory.Text == string.Empty)
                {
                    MessageBox.Show("Please Select category");
                    cmboCategory.Focus();
                }
                else
                {
                    string Filename;
                    if (txtAttachmentFileName.Text != string.Empty)
                    {
                        Filename = DateTime.Now.ToString("yyyyMMddhhmmss") + lblFileExtension.Text;
                    }
                    else
                    {
                        Filename = "";
                    }
                    string sql1 = " insert into tbl_expense (Date , ReferenceNo , Category ,	Amount ,	Attachment , fileextension, Note ,	Createdby) "+
                                  " values ('" + dtStartDate.Text + "', '" + txtReferNo.Text + "','" + cmboCategory.Text + "', '" + txtAmount.Text + "',  " +
                                  " '" + Filename + "', '" + lblFileExtension.Text + "', '" + txtNote.Text + "' , '" + UserInfo.UserName + "')";
                    DataAccess.ExecuteSQL(sql1);

                    if (txtAttachmentFileName.Text != string.Empty)
                    {
                        //Attachment upload  /////////////////
                        string path = Application.StartupPath + @"\ExpenseAttachment\";
                        if (!System.IO.Directory.Exists(path))
                        {
                            System.IO.Directory.CreateDirectory(Application.StartupPath + @"\ExpenseAttachment\");
                        }
                        string copyfile  = lblcopyfile.Text;       //Source file
                        string pastefile = path + @"\" + Filename; //destination file
                        System.IO.File.Copy(copyfile, pastefile);
                    }

                    MessageBox.Show("Saved Successfully", "Successful", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    DialogResult result = MessageBox.Show("Do you want to add a new Expense?", "Yes or No", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2);
                    if (result == DialogResult.Yes)
                    {
                        txtAmount.Text  = string.Empty;
                        txtNote.Text    = string.Empty;
                        txtReferNo.Text = string.Empty;
                    }
                    else
                    {
                        this.Hide();
                        Expenses.ExpensesList go = new Expenses.ExpensesList();
                        go.MdiParent = this.ParentForm;
                        go.Show();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }