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> <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);
}
}
}
}
}

This might help... although you'll need to adjust it to be UpdateParameters on an update etc.

SqlDataSource1.SelectParameters["ParamName"] =

newParameter("ParamName",TypeCode.String,"Value");sql