Quero que ao seleccionar uma data no date time picker, só pode selecionar uma data menor ou igual a data apresentada em (select u_replica from e_industrial.dbo.e1) na base dados.

private void btn_search_Click(object sender, EventArgs e) {

        SqlConnection conn = new SqlConnection("Data Source=...;Initial Catalog=Innux;Persist Security Info=True;");         conn.Open();         SqlDataAdapter SDA = new SqlDataAdapter("select dbo.Alteracoes.Data, dbo.Funcionarios.numero as no, dbo.Funcionarios.nome, DATEPART(hour, Falta) AS faltas, DATEPART(hour, Coluna2) AS  horasextra  from dbo.Alteracoes inner join dbo.Funcionarios on dbo.Alteracoes.IDFuncionario = dbo.Funcionarios.IDFuncionario inner join dbo.Departamentos on dbo.Funcionarios.IDDepartamento = dbo.Departamentos.IDDepartamento WHERE Data = '" + dateTimePicker1.Value.ToString("yyyy/MM/dd") + "'", conn);         DataSet dt = new DataSet();             SDA.Fill(dt, "dbo.Alteracoes.Data");         dataGridView1.DataSource = dt.Tables["dbo.Alteracoes.Data"];         conn.Close();     }      private void dateTimePicker1_ValueChanged(object sender, EventArgs e)     {         //dateTimePicker1.MaxDate = DateTime.Now;         SqlConnection conn = new SqlConnection("Data Source=192.168.100.4;Initial Catalog=Innux;Persist Security Info=True;User ID=sa;Password=qwe-123,");         conn.Open();         SqlDataAdapter pickerMaxDate = new SqlDataAdapter("select u_replica from e_industrial.dbo.e1'" + dateTimePicker1.Value.ToString("yyyy/MM/dd") + "'", conn);           String pickerMaxDateString = pickerMaxDate.ToString();         DateTime dtMax = Convert.ToDateTime(pickerMaxDateString);          dateTimePicker1.MinDate = dtMax;          conn.Close();     }