How to populate datagridview only if there is data

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C#

ASP.NET

Hi all,
I have a windows form with two textbox,one combobox,one button and a datagridview .The datgridview is binded using stored procedure i.e when the textbox and combobox is filled and click button the datagridview must be populated.I need to populate datagridview only if there is a data.If the data is empty the datagidview should display "No records found".

What I have tried:

private void button2_Click(object sender, EventArgs e)
       {

           if (txt_VoucherNo.Text.Trim() != "")
           {
               Voucher = txt_VoucherNo.Text.Trim();
           }
           if (ddl_prt.SelectedValue.ToString().Trim() != "")
           {
               prt = ddl_prtSelectedValue.ToString().Trim();
           }

           if (batch.Text.Trim() != "")
           {
               batch = txt_batchno.Text.Trim();
           }


           //GET Data From Database
           var connectionstring=ConfigurationManager.ConnectionStrings["PROCConnectionString"].ConnectionString;
           SqlConnection cn = new SqlConnection(connectionstring);


           SqlCommand cmd = new SqlCommand();
           cmd.CommandType = CommandType.StoredProcedure;
           cmd.CommandText="SP44";

           cmd.Parameters.AddWithValue("Voucher", Voucher);
           cmd.Parameters.AddWithValue("prt", prt);
           cmd.Parameters.AddWithValue("batch", batch);
           cmd.CommandTimeout = 999999;
           cmd.Connection=cn;

           try
           {
               cn.Open();
               DataTable dt = new DataTable();
               //dt = cmd.ExecuteReader();
               SqlDataReader dr = cmd.ExecuteReader();
               dt.Load(dr);
               dataGridView1.DataSource = dt;



           }
           catch (Exception ex)
           {

           }
           finally
           {
               cmd.Connection.Close();
               cn.Close();
           }


       }

//This is my code when the button is clicked.Here the datgridview (only headers) are loaded if there is no data.How can I load the datagridview only if there is data.Any help will be really appreciated.