Insert and Update on the same button.

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ASP.NET

C#3.5

I have a web form to where a user can enter data and save it to the database. I also have it to where the user can come back and update the data they submitted into the database. When the user comes back to the web form and edits their data, how can I get the data to update and not insert another record it the record already exists on the same button? Here is my save button code:

protected void ButtonSave_Click(object sender, EventArgs e)
    {
        SqlConnection con7 = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["HotConnectionString"].ConnectionString);
        con7.Open();

        SqlCommand cmd = new SqlCommand("Insert into Table445 (User_ID, FT_UNDERGR, DATE, FT_GRAD, FTE_UNDERG, FTE_GRAD, NON_CREDIT, TOTAL_FTE, FCFTUHC, FCFTPBHC, FCPTUHC, FCPTPBHC, NCHC, UnderG12, Postb9, Total123b4b, FTEYR, THCAS, FTE40, HC50) values (@User_ID, @FT_UNDERGR, @DATE, @FT_GRAD, @FTE_UNDERG, @FTE_GRAD, @NON_CREDIT, @TOTAL_FTE, @FCFTUHC, @FCFTPBHC, @FCPTUHC, @FCPTPBHC, @NCHC, @UnderG12, @Postb9, @Total123b4b, @FTEYR, @THCAS, @FTE40, @HC50);", con7);

        cmd.CommandType = CommandType.Text;

        cmd.Parameters.AddWithValue("@INST_ID", TextBoxINST_ID.Text);
        cmd.Parameters.AddWithValue("@FT_UNDERGR", TextBoxFTUG.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@FT_GRAD", TextBoxFTG.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@FTE_UNDERG", TextBoxTHUGDR.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@FTE_GRAD", TextBoxTHGDR.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@NON_CREDIT", TextBoxNCCDR.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@TOTAL_FTE", TextBoxTCNC.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@FCFTUHC", TextBoxTNFUG.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@FCFTPBHC", TextBoxTNFG.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@FCPTUHC", TextBoxTNCPUG.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@FCPTPBHC", TextBoxTNCPG.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@NCHC", TextBoxTNNCC.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@FTEYR", lblYEAR1.Text);
        cmd.Parameters.AddWithValue("@DATE", TextBoxDATE.Text);
        cmd.Parameters.AddWithValue("@UnderG12", TextBoxTHUG.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@Postb9", TextBoxTHG.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@Total123b4b", TextBoxT1234.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@THCAS", TextBoxTHCAS.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@FTE40", TextBoxFTE40.Text.Replace(",", ""));
        cmd.Parameters.AddWithValue("@HC50", TextBoxHC50.Text.Replace(",", ""));
        

        cmd.ExecuteNonQuery();

        if (Page.IsPostBack)
        {
            ScriptManager.RegisterStartupScript(this, typeof(Page), "myscript", "alert('You have successfully saved the electronic portion of the Enrollment Profile. You will now be direct to the Graduation Rate Information Page');location.href='Gradrate.aspx';", true);
        }
    }
}

Is there a way to put the Insert and Update on the same button?

Here is a code I used for checking to see if a user exists. Can I use this same code for the record to see if it exists and update if it does and insert if not?

if (IsPostBack)
        {
            SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["HotConnectionString"].ConnectionString);
            con.Open();
            string cmdStr = "Select count(*) from Table99 where EmailAddress='" + TextBoxEA.Text + "'";
            SqlCommand userExist = new SqlCommand(cmdStr, con);
            SqlCommand cmd = new SqlCommand("select USer_ID, EmailAddress from Table99", con);
            int temp = Convert.ToInt32(userExist.ExecuteScalar().ToString());
            if (temp == 0)
            {
                ScriptManager.RegisterStartupScript(this, this.GetType(), "script", "alert('User Name Does Not Exist You Must Fill Out Registration First');", true);
                TextBoxEA.Text = string.Empty;
            }
            else if (temp == 1)
            {
                ScriptManager.RegisterStartupScript(this, this.GetType(), "script", "alert('Invalid UserName / Password');", true);
            }