How do I check if row exists or not?

Question

This is my code to display/search a record in a database table. How do I put a validation whether the roecord exists or not? It is searching through the ID of a member. how should I show a message if the record does not exist?

 string connectionstring = "Server=Momal-PC\\MOMAL;Database=Project;Trusted_Connection=True;";
 SqlConnection conn = new SqlConnection();
 conn.ConnectionString = connectionstring;
 conn.Open();


  SqlDataAdapter sda = new SqlDataAdapter("Select * from Members where Number = '" + SearchID.Text + "'", conn);
  DataTable dtStock = new DataTable();

  sda.Fill(dtStock);
  dataGridView1.DataSource = dtStock;

  conn.Close();

Answer 1

if( 0 == dtStock.Rows.Count ) // does not exist

Answer 2

You can use like this:

If(dtStock.Rows.Count > 0) // If dtStock.Rows.Count == 0 then there is no rows exists.
{
    // Your Logic
}

See Here & Here. How to use Dataset and DataTables.

Answer 3

You can use DataRowCollection.Count property.

Gets the total number of DataRow objects in this collection.

If(0 == dtStock.Rows.Count)
  Console.WriteLine("There are no rows in that datatable")

Answer 4

You can do something like this

    If(dtStock.Rows.Count > 0) 
    {
    //code goes here
    dataGridView1.DataSource = dtStock;
    }
    else
    {
    //Record not exists
    }