C#

MdiForm mdiParent = MdiForm.Instance()
frmForm2 frmChild;
frmChild = frmForm2.Instance(); // yes, the both are singleton!
frmChild.MdiParent = mdiParent;

frmForm2 frmChild;
frmChild = frmForm2.Instance(); // yes, the both are singleton!
frmChild.MdiParent = this.MdiParent;

return "This is my string";

Pete O'Hanlon wrote:

ur

DaveAuld wrote:

Is that from your galaxy 10.1?

• Open pdf file1 and file2 for input.
• Open pdf file3 for output.
• Read pages 1 to 14 from file1 and write to file3.
• Read page 15 from file2 and write to file3.
• Read remaining pages from file1 and write to file3
• Close all files.

System.NullReferenceException: Object reference not set to an instance of an object.
at PriceList.frmMain.populate_family_physician()
at PriceList.frmMain.frmMain_Load(Object sender, EventArgs e)

Sandeep Mewara wrote:

This error happens when you try to use a property of an object that is null.
More details:

private void populate_family_physician()
{
    this.Cursor = Cursors.WaitCursor;

    data_table = new DataTable();

    sql_connection = new MySqlConnection(ConfigurationManager.ConnectionStrings["SQLdb"].ConnectionString);

    // try
    // {
    sql_connection.Open();
    sql_command = new MySqlCommand("sp_get_pricelist_by_code", sql_connection);
    sql_command.CommandType = CommandType.StoredProcedure;
    sql_command.Parameters.AddWithValue("param_pricelist_code", "FamilyPhysician").MySqlDbType = MySqlDbType.VarChar;
    sql_adapter = new MySqlDataAdapter(sql_command);
    sql_adapter.Fill(data_table);
    dataFamilyPhysician.DataSource = null;
    dataFamilyPhysician.ResetBindings();
    dataFamilyPhysician.DataSource = data_table;

    gridFamilyPhysician.Columns["price_list_id"].Caption = "price_list_id";
    gridFamilyPhysician.Columns["price_list_id"].AppearanceHeader.TextOptions.HAlignment = DevExpress.Utils.HorzAlignment.Center;
    gridFamilyPhysician.Columns["price_list_id"].AppearanceCell.TextOptions.HAlignment = DevExpress.Utils.HorzAlignment.Center;
    gridFamilyPhysician.Columns["price_list_id"].Width = 80;
    gridFamilyPhysician.Columns["price_list_id"].Visible = false;

    gridFamilyPhysician.Columns["price_list_description"].Caption = "Description";
    gridFamilyPhysician.Columns["price_list_description"].AppearanceHeader.TextOptions.HAlignment = DevExpress.Utils.HorzAlignment.Default;
    gridFamilyPhysician.Columns["price_list_description"].AppearanceCell.TextOptions.HAlignment = DevExpress.Utils.HorzAlignment.Default;
    gridFamilyPhysician.Columns["price_list_description"].Width = 150;

    gridFamilyPhysician.Columns["price_list_price"].Caption = "Price";
    gridFamilyPhysician.Columns["price_list_price"].AppearanceHeader.TextOptions.HAlignment = DevExpress.Utils.HorzAlignment.Center;
    gridFamilyPhysician.Columns["price_list_price"].AppearanceCell.TextOptions.HAlignment = DevExpress.Utils.HorzAlignment.Center;
    gridFamilyPhysician.Columns["price_list_price"].DisplayFormat.FormatType = DevExpress.Utils.FormatType.Numeric;
    gridFamilyPhysician.Columns["price_list_price"].DisplayFormat.FormatString = "#,###,##0.000";
    gridFamilyPhysician.Columns["price_list_price"].Width = 50;

    this.Cursor = Cursors.Default;
}