How to pass query string in Database driven menu in asp.net

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I have database drive menu in the master page and have two tables master menu (menuid,menuname and loctaion)and product table i have stored the menu id in product table. now i want to display the product Details in view products.aspx page by getting the menuid in query string

C#

private void BindGridData()
   {
       con.Open();

       int menuid = int.Parse(Request.QueryString["MenuId"]);
       //string menuid = Request["id"].ToString();
       string sql = "select pro.ProductID,pro.MenuId,pro.ProductName,pro.ProductDescription,pro.Price,pro.ProductImage from rsa_ProductItemTable As pro,rsa_mastermenu As me where me.MenuId=pro.MenuId='" + menuid + "'";
           SqlDataAdapter da = new SqlDataAdapter(sql, con);
           DataSet ds = new DataSet();
           da.Fill(ds);
           DataList1.DataSource = ds;
           DataList1.DataBind();
           con.Close();
       }

And the error is Value cannot be null.
Parameter name: String
Please Help Me with this

Posted 2-Dec-14 6:49am

kwelpooh

Updated 2-Dec-14 6:52am

DamithSL

v2

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2 solutions

Solution 1

try below sql statement, I have change your SQL and also added parameter

C#

string sql = "select pro.ProductID,pro.MenuId,pro.ProductName,pro.ProductDescription,pro.Price,pro.ProductImage from rsa_ProductItemTable As pro join rsa_mastermenu As me on  me.MenuId=pro.MenuId where pro.MenuId =@MenuId"; 
SqlDataAdapter da = new SqlDataAdapter(sql, con);
da.SelectCommand.Parameters.AddWithValue("@MenuId",menuid); 
DataSet ds = new DataSet();
da.Fill(ds);

Posted 2-Dec-14 6:59am

DamithSL

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Badal Kumar · Accepted Answer · 2014-12-02T09:48:00

1. Problem in writing the query: print your query you will get the error. Are you able to run the query in sql.
2. Correct you query like:

select pro.ProductID,pro.MenuId,pro.ProductName,pro.ProductDescription,pro.Price,pro.ProductImage from rsa_ProductItemTable As pro join rsa_mastermenu As me on me.MenuId=pro.MenuId and pro.MenuId ='" + menuid + "'";