Question

***Coding in C#

This works:

        NpgsqlConnection conn = new NpgsqlConnection(conx.getConexion());
        conn.Open();     
        NpgsqlDataAdapter da = new NpgsqlDataAdapter("Select \"NombreMarca\" From \"Marca\" Where \"NombreMarca\" ='"+cbMarca.Text.ToLower()+"'", conn);
        System.Data.DataTable dt = new System.Data.DataTable();
        da.Fill(dt);
        conn.Close();

//cbMarca is a ComboBox

Now, this doesnt:

        NpgsqlConnection conn = new NpgsqlConnection(conx.getConexion());
        conn.Open();     
        NpgsqlDataAdapter da = new NpgsqlDataAdapter("Select \"NombreMarca\" From \"Marca\" Where \"NombreMarca\" ='"+cbMarca.Text.ToUpper()+"'", conn);
        System.Data.DataTable dt = new System.Data.DataTable();
        da.Fill(dt);
        conn.Close();

And i need it in upper!

Answer 1

Do you want to compare all values with the string supplied or do you want to filter out all upper cased strings?

For a just comparing the values against each other try changing the column to upper case as well:

NpgsqlDataAdapter da = new NpgsqlDataAdapter("Select NombreMarca From Marca Where UPPER(NombreMarca) ='"+cbMarca.Text.ToUpper()+"'", conn);