Losing It Again - How To Pass Value To Sp?

I cannot remember how to pass a value to a stored procedure.  I would work this through but I am really running out of time, any help greatly appreciated.  This is my stored procedure and I need to pass CompanyID from the code behind page in for the stored procedure @C_ID value.

PROCEDURE dbo.EditCompanyInfo
 @C_ID int,
 @CS_CompanyName nchar(100),
 @CS_City nchar(50)
 
AS
 UPDATE tblCompanyInfo_Submit
 SET CS_CompanyName = @CS_CompanyName, CS_City = @CS_City
 WHERE C_ID = @C_ID
 RETURN

This is my aspx. page:

 <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" Runat="Server" >
    <asp:TextBox ID="TextBox1" runat="server"> </asp:TextBox>    <br />
    <asp:TextBox ID="TextBox2" runat="server"> </asp:TextBox>&nbsp;<br />
    <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox><br />
    <asp:DetailsView ID="DetailsView1" runat="server" DataSourceID="SqlDataSource2" Height="50px"
        Width="125px">
        <Fields>
            <asp:CommandField ShowEditButton="True" ShowInsertButton="True" />
        </Fields>
    </asp:DetailsView>
    <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString2 %>"
        InsertCommand="CompanyInfoSubmit" InsertCommandType="StoredProcedure"  OnInserted="SqlDataSource2_Inserted"
        SelectCommand="SELECT CS_CompanyName, CS_City FROM tblCompanyInfo_Submit WHERE C_ID = @CompanyID "
        UpdateCommand="EditCompanyInfo" UpdateCommandType="StoredProcedure">
        <UpdateParameters>
            <asp:Parameter Name="CS_CompanyName" Type="String" />
            <asp:Parameter Name="CS_City" Type="String" />
        </UpdateParameters>
        <InsertParameters>
            <asp:Parameter Direction="ReturnValue" Name="ReturnValue" Type="Int32" />
            <asp:Parameter Name="CS_CompanyName" Type="String" />
            <asp:Parameter Name="CS_City" Type="String" />
        </InsertParameters>
    </asp:SqlDataSource>
    <br />
</asp:Content>

CODE BEHIND:

public partial class aaatest : System.Web.UI.Page
{
    int CompanyID;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            DetailsView1.ChangeMode(DetailsViewMode.Insert);
            TextBox1.Text = "insert";
            TextBox3.Text = Convert.ToString(CompanyID);
        }
    }
    protected void SqlDataSource2_Inserted(object sender, SqlDataSourceStatusEventArgs e)
    {
        {
            foreach (System.Data.SqlClient.SqlParameter param in e.Command.Parameters)
            {
                string RValue = Server.HtmlEncode(param.Direction.ToString());
                if ( RValue == "ReturnValue" && Page.IsPostBack)
                {
                    TextBox1.Text = Server.HtmlEncode(param.Value.ToString());
                    TextBox2.Text = "Return";
                    CompanyID = Convert.ToInt16(TextBox1.Text);
                    TextBox3.Text = Convert.ToString(CompanyID);
                }
            }
        }
    }
}