Attempted to read or write protected memory.
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Thread: Attempted to read or write protected memory.

  1. #1
    Join Date
    Mar 2014

    Attempted to read or write protected memory.

    I have two from in visual studio 2010 with C#.
    In form1 I have one combobox and one button .In form2 I have Reportviewer . When Button in form1 is clicked form2 is shown. Now my problem is when I click button to show form2 on the line Form2.Show(); this error appear :
    Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
    What can i do?
    In form1 I have one combobox that combo fill with Database with this code in the Form Load:
    private void DocReportOnlyAlalhesabSearch_Load(object sender, EventArgs e)

    //fill shahrestan Combo
    if (Class.Global.CurrentYear.Length != 0)
    OleDbConnection conn1;
    OleDbCommand cmd1;
    cmd1 = new OleDbCommand();
    string connectionstring = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|" + "\\DB\\" + Class.Global.CurrentYear;
    conn1 = new OleDbConnection(connectionstring);
    cmd1.CommandType = CommandType.Text;


    cmd1 = new OleDbCommand("SELECT * From tblShahrestanName ;", conn1);

    OleDbDataReader myreader = cmd1.ExecuteReader();

    int countrow;
    countrow = 0;
    if (myreader.HasRows)

    while (myreader.Read())
    cmbNameShahrestan.Items.Insert(countrow, myreader["ShahrestanName"].ToString().Trim());
    countrow = countrow + 1;




    catch (Exception Ar)


    //end fill shahrestan combo

    In a button click on the form1 I have this code :
    private void btnSearch_Click(object sender, EventArgs e)
    Form2 Form2 = new Form2();



    In form2 I have A report viewer in form load of that I have this code:
    private void Form2_Load(object sender, EventArgs e)
    OleDbConnection con = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|" + "\\DB\\" + Class.Global.CurrentYear);
    OleDbDataAdapter da = new OleDbDataAdapter("SELECT * from DocReportAlalhesabJoda", con);

    DataSet ds = new DataSet();


    ds.Tables[0].TableName = "DataTableDocReportAlalhesabJoda";

    reportViewer1.LocalReport.DataSources.Add(new Microsoft.Reporting.WinForms.ReportDataSource("DataSet1", ds.Tables[0]));



  2. #2
    Join Date
    Mar 2005
    Vienna, Austria

    Re: Attempted to read or write protected memory.

    Form2 Form2 = new Form2();
    You cannot d this. as yu have the same Name for the class and the variable.

    You Need to write someting like
    Form2 frm = new Form2();
    Jonny Poet

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