No mapping exists

Question

Greeting

 

I faced this problem 

 

No mapping exists from object type System.Web.UI.WebControls.Label to a known managed provider native type 

 

here that code:

protected void DetailsView1_ItemCommand(object sender, DetailsViewCommandEventArgs e)
{

    try
    {
        using (SqlConnection sqlcon = new SqlConnection(connectionString))
        {
            if (e.CommandName.Equals("AddNew"))
            {
                Label llbc = (Label)DetailsView1.FindControl("Lb_cat");
                FileUpload fu = (FileUpload)DetailsView1.FindControl("FU_footer");
                if (fu.HasFile)
                {
                    string fileName = fu.FileName;
                    string exten = Path.GetExtension(fileName);
                    //here we have to restrict file type
                    exten = exten.ToLower();
                    string[] acceptedFileTypes = new string[4];
                    acceptedFileTypes[0] = ".jpg";
                    acceptedFileTypes[1] = ".jpeg";
                    acceptedFileTypes[2] = ".gif";
                    acceptedFileTypes[3] = ".png";
                    bool acceptFile = false;
                    for (int i = 0; i <= 3; i++)
                    {
                        if (exten == acceptedFileTypes[i])
                        {
                            acceptFile = true;
                        }
                    }
                    if (!acceptFile)
                    {
                        lberrormsg.Text = "The file you are trying to upload is not a permitted file type!";
                    }
                    else
                    {
                        //upload the file onto the server
                        fu.SaveAs(Server.MapPath("~/images/categories/" + fileName));
                        //Open Connection with D.B

                        sqlcon.Open();
                        string query = "INSERT INTO Products(P_Name,Ingredients,P_Price,P_photo) VALUES(@P_Name,@Ingredients,@P_Price,@P_photo)";
                        SqlCommand sqlcmd = new SqlCommand(query, sqlcon);

                        sqlcmd.Parameters.AddWithValue("@P_Name", (DetailsView1.FindControl("TB_Name") as TextBox).Text.Trim());
                        sqlcmd.Parameters.AddWithValue("@Ingredients", (DetailsView1.FindControl("TB_Ing") as TextBox).Text.Trim());
                        //sqlcmd.Parameters.AddWithValue("@P_Enable", Convert.ToBoolean (DetailsView1.FindControl("Ch_enabled") as CheckBox));
                        sqlcmd.Parameters.AddWithValue("@P_Price", (DetailsView1.FindControl("TB_Price") as TextBox).Text.Trim());
                        sqlcmd.Parameters.AddWithValue("@P_photo", fileName);
                        sqlcmd.Parameters.AddWithValue("@C_Id", (DetailsView1.FindControl("Lb_cat") as Label));

                        sqlcmd.ExecuteNonQuery();
                        DetailsView1.DataBind();
                        lbsuccessmsg.Text = "New Record Added";
                        lberrormsg.Text = "";

                    }
                }
            }
        }
    }
    catch (Exception ex)
    {

        lbsuccessmsg.Text = "";
        lberrormsg.Text = ex.Message;
    }
}


protected void DetailsView1_DataBound1(object sender, EventArgs e)
{
    DropDownList dr = (DropDownList)DetailsView1.FindControl("DDLCategory");
    Label lb1 = (Label)DetailsView1.FindControl("Lb_cat");
    lb1.Text = dr.SelectedItem.Value.ToString();
}

So..what's wrong