Selecting table Id with UserName showing error 'The name 'id' does not exist in the current context' in ASP.Net

error

Server Error in '/' Application.
Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0103: The name 'id' does not exist in the current context

Source Error:


Line 41:             {
Line 42:                //Int32 id;
Line 43:                 BindDatalist(username, id);
Line 44:               
Line 45:             }

code

protected void Page_Load(object sender, EventArgs e)
{
   if (this.Page.User.Identity.IsAuthenticated)
     {
        string username = this.Page.User.Identity.Name;
        int id ;           
        // Session["Name"] = Session["Name"].ToString();
         if (!IsPostBack)
         {
            //Int32 id;
             BindDatalist(username, id);              
         }
     }
}

public void BindDatalist(string username, int id)
{
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);
    SqlDataAdapter adp = new SqlDataAdapter("GetMessage", con);
    adp.SelectCommand.CommandType = CommandType.StoredProcedure;
    adp.SelectCommand.Parameters.AddWithValue("@UserName", username );
    adp.SelectCommand.Parameters.AddWithValue("@Id", id);
    DataTable dt = new DataTable();
    adp.Fill(dt);
    if (dt.Rows.Count > 0)
    {
        GetMergedAll.DataSource = dt;
        GetMergedAll.DataBind();    
    }
}