how to write Windows Ce application data source

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hello everyone ..
can anyone tell me how to use "DataDirectory" for data source
because i get this error when i run the program {The path is not valid.check the directory for the database ,[Path=|DataDirectory|//localdata.sdf} so guys can you plz help me

C#

using System.Data.SqlServerCe;

namespace Smartdevice
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            loadcom();
        }
        SqlCeConnection  cn = new SqlCeConnection("Data Source=|DataDirectory|\\MyDatabase#1.sdf");
        private void button1_Click(object sender, EventArgs e)
        {
           SqlCeCommand cmd = new SqlCeCommand("insert into Tt (name)  values(@name)",cn);
            cn.Open();
            
            cmd.Parameters.AddWithValue("@name",textBox1.Text);
            cmd.ExecuteNonQuery();
         
            cn.Close();
        }
        private  void loadcom()
        {
            cn.Open();
            SqlCeCommand cmd = new SqlCeCommand("select name from Tt",cn);
            SqlCeDataReader dr;
            dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                comboBox1.Items.Add(dr["name"].ToString());
            }


            cn.Close();

Posted 5-Mar-15 1:51am

jame01

Updated 5-Mar-15 11:00am

v2

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2 solutions

Solution 2

thank you so much johannesnestler for your answers ,,,,
i got solution and i gone put it here it maybe useful for someone else one day ....

C#

string stconnect = Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase);
string stdataconn= Path.Combine(stconnect, "MyDatabase#1.sdf");
string stsqlc = string.Format("DataSource={0}", stdataconn);
sqlceconnect cn=new sqlceconnect(stqlc);

thanks

Posted 6-Mar-15 8:00am

jame01

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johannesnestler · Accepted Answer · 2015-03-06T01:00:00

Hi ari,

Maybe have a look at https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.connectionstring(v=vs.110).aspx[^]

So I think in your case this will result in:
(One backslash should be the root-path on your ce device - although I don't believe you can place it there for persistence - but that's another Story...)

@"Data Source=\MyDatabase#1.sdf";