Question

In winform app i have a datagridview for showing the database values. i use these following codes to see the result between two specific datetime for example between 6/5/2010 and 7/5/2010 but it just show me the rows which exactly updated in these datetime. i mean it just show me the rows which has exact Registrationday and finish day. i want to see all the results between these times.

private void button1_Click(object sender, EventArgs e)
    {
        sql = new SqlConnection(@"Data Source=PC-PC\PC;Initial Catalog=Test;Integrated Security=True");
        adapter = new SqlDataAdapter("select EntryID,Name,FamilyName,Registrationday,Finishday,Fee from Entry where Registrationday =@Registrationday AND Finishday =@Finishday", sql);
        adapter.SelectCommand.Parameters.AddWithValue("@Signday", Convert.ToDateTime(textBox1.Text).ToShortDateString());
        adapter.SelectCommand.Parameters.AddWithValue("@Finishday", Convert.ToDateTime(textBox2.Text).ToShortDateString());
        dt = new DataTable();
        adapter.Fill(dt);
        dataGridView1.DataSource = dt;
    }

Answer 1

For rows overlapping your interval:

Registrationday <= @Finishday AND Finishday >= @Registrationday 

This matches all the following rows:

-------R-------F-----------
    *------------*
     *------*
       *---*
          *---*
            *------*

For rows contained entirely within your interval:

Registrationday >= @Registrationday AND Finishday <= @Finishday 

This matches only these rows:

-------R-------F-----------
       *---*
          *---*