How to populate textboxes with data that has multi numbers?

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ASP.NET

C#3.5

I have a web form that populates data from the database. That part works fine. I have a database that has a User ID and different Unit IDs. I know I could just make a Grid View to display all of the data just for that user but I wanted to know if there is a way to do it to a textbox?

Example:

USER | Unit ID | Car | Truck |
100  | 200     |  1  |   2   |
100  | 300     |  3  |   4   |
100  | 400     |  6  |   7   |

How can this data be populated into textboxes?

Here is the current code I use to populate textboxes:

if (TextBoxINST_ID.Text.Trim().Length > 0)
            {
                SqlConnection con3 = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["HotConnectionString"].ConnectionString);
                con3.Open();

                SqlCommand scmd3 = new SqlCommand("Select FT_UNDERGR, FT_GRAD, FTE_UNDERG, FTE_GRAD, NON_CREDIT, TOTAL_FTE, FCFTUHC, FCFTPBHC, FCPTUHC, FCPTPBHC, NCHC, FTE40, HC50, FTE4050, UnderG12, Postb9, Total123b4b, THCAS from Table88 where User_ID = '" + TextBoxUser_ID.Text + "'", con3);
                SqlDataReader dr3 = scmd3.ExecuteReader();
                if (dr3.Read())
                {
                    TextBoxFTUG2.Text = dr3["FT_UNDERGR"].ToString();
                    TextBoxFTG2.Text = dr3["FT_GRAD"].ToString();
                    TextBoxTHUGDR2.Text = dr3["FTE_UNDERG"].ToString();
                    TextBoxTHGDR2.Text = dr3["FTE_GRAD"].ToString();
                    TextBoxNCCDR2.Text = dr3["NON_CREDIT"].ToString();
                    TextBoxTCNC2.Text = dr3["TOTAL_FTE"].ToString();
                    TextBoxTNFUG2.Text = dr3["FCFTUHC"].ToString();
                    TextBoxTNFG2.Text = dr3["FCFTPBHC"].ToString();
                    TextBoxTNCPUG2.Text = dr3["FCPTUHC"].ToString();
                    TextBoxTNCPG2.Text = dr3["FCPTPBHC"].ToString();
                    TextBoxTNNCC2.Text = dr3["NCHC"].ToString();
                    TextBoxFTE402.Text = dr3["FTE40"].ToString();
                    TextBoxHC502.Text = dr3["HC50"].ToString();
                    TextBoxFTE40502.Text = dr3["FTE4050"].ToString();
                    TextBoxTHUG2.Text = dr3["UnderG12"].ToString();
                    TextBoxTHG2.Text = dr3["Postb9"].ToString();
                    TextBoxT12342.Text = dr3["Total123b4b"].ToString();
                    TextBoxTHCAS2.Text = dr3["THCAS"].ToString();
                    ButtonSubmit2.Visible = true;

                }
                con3.Close();
                dr3.Close();