The following procedure can be used.
BindingSource bindingSource1 = new BindingSource();
bindingSource1.DataSource = NorthWindDataset1;
bindingSource1.DataMember="Customers";
dataGridView1.DataSource = bindingSource1;
string filterString = string.Format("CustomerID='{0}' and City='{1}' and Region='{2}",textBox1.Text.Trim(), textBox2.Text.Trim(), textBox3.Text.Trim());
bindingSource1.Filter=filterString;