Question

I have this combobox

BindingSource srd = new BindingSource();
srd.DataSource = llenar.Tables["cnae"];
CmbCnaePrin.DataSource = srd;
CmbCnaePrin.DisplayMember = "cnae_descricao";
CmbCnaePrin.ValueMember = "cnae_id";

i want to load this

int cnaepr;
DataTable dt3 = new DataTable();
dt3 = ifd.cnaeclas(cnaepr);
txtCnaeC.Text = dt3.Rows[0][2].ToString();
txtCnaeSC.Text = dt3.Rows[0][3].ToString();

but i can not convert

 cnaepr=Convert.ToInt32(CmbCnaePrin.SelectedValue)

returns this error Unable to cast object of type ‘System.Data.DataRowView’ to type ‘System.IConvertible’.

Answer 1

Try calling ToString() on the SelectedValue property:

cnaepr=Convert.ToInt32(CmbCnaePrin.SelectedValue.ToString());

The error is pretty much exactly what it says; the SelectedValue property is designed to be very generic so it can be anything you could find in a DataTable. Most of those things that it could be are not “convertible” types (implementing IConvertible).