Combobox и DataGrid

       da.Fill(dt);

   SqlConnection conn = new SqlConnection(connStr);
            SqlDataAdapter da = new SqlDataAdapter(@"SELECT " + comboBox1.SelectedItem + @".* FROM " + comboBox1.SelectedItem, conn);
            DataTable dt = new DataTable();
            da.Fill(dt);
            dataGridView1.DataSource = dt;

SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM " + comboBox1.SelectedItem.ToString(), conn);

   SqlConnection conn = new SqlConnection(connStr);
            string command = "SELECT * FROM sysobjects WHERE type = 'U' order by name ";
            SqlDataAdapter da = new SqlDataAdapter(command, conn);
            DataTable dt = new DataTable();
            da.Fill(dt);
 
            comboBox1.DataSource = dt;
            comboBox1.DisplayMember = "Имя";
            comboBox1.ValueMember = "name";

string command = "SELECT * FROM " + comboBox1.SelectedItem.ToString();
SqlDataAdapter da = new SqlDataAdapter(command , conn);

string command = "SELECT * FROM " + comboBox1.SelectedValue.ToString();

comboBox1.DataSource = dt;
comboBox1.DisplayMember = "Имя";
comboBox1.ValueMember = "name";

comboBox1.SelectedValue.ToString()