Data type mismatch in criteria expression.

protected void gvDetails_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {

        int userid = Convert.ToInt32(gvDetails.DataKeys[e.RowIndex].Value.ToString());
        //ring user = gvDetails.DataKeys[e.RowIndex].Values["UserName"].ToString();

        string username = gvDetails.DataKeys[e.RowIndex].Values["U_name"].ToString();
        //string imagename = gvDetails.DataKeys[e.RowIndex].Values["ImageName"].ToString();

        TextBox txtU_Email = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtU_Email");
        TextBox txtImageName = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtImageName");
        TextBox txtDescription = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtDescription");
        TextBox txtCategoryName = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtCategoryName");

        TextBox txtADshop_name = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtADshop_name");
        TextBox txtADShop_Address = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtADShop_Address");
        TextBox txtADshop_city = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtADshop_city");
        TextBox txtADshop_mob = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtADshop_mob");
        TextBox txtADshop_Email = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtADshop_Email");
        TextBox txtAreaName = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtAreaName");
        TextBox txtstartddate = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtstartddate");
        TextBox txtendddate = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtendddate");
        TextBox txtImagePath = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtImagePath");
        TextBox txtdiffrence = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtdiffrence");
        con.Open();
        
        
        OleDbCommand cmd = new OleDbCommand("UPDATE LOGIN u ,SlideShowTable s SET u.U_Email = '" + txtU_Email.Text + "',s.ImageName='" + txtImageName.Text + "',s.Description='" + txtDescription.Text + "',s.CategoryName='" + txtCategoryName.Text + "',s.ADshop_name='" + txtADshop_name.Text + "',s.ADShop_Address='" + txtADShop_Address.Text + "',s.ADshop_city='" + txtADshop_city.Text + "',s.ADshop_mob='" + txtADshop_mob.Text + "',s.ADshop_Email='" + txtADshop_Email.Text + "',s.AreaName='" + txtAreaName.Text + "',s.startddate='" + txtstartddate.Text + "',s.endddate='" + txtendddate.Text + "',s.ImagePath='" + txtImagePath.Text + "',s.diffrence='" + txtdiffrence.Text + "' where s.U_id=" + userid + " and u.U_id= " + userid, con);



        cmd.ExecuteNonQuery();
        con.Close();
        lblresult.ForeColor = Color.Green;
        lblresult.Text = username + " Details Updated successfully";
        gvDetails.EditIndex = -1;
        BindEmployeeDetails();
    }