about querystring in.net

Question

hai
in asp.net can i able to pass the query string with in the page.likewise
in first.aspx
<a href="first.aspx?str=role">BY Role</a>
in first.aspx.cs
string str1
str1=Request.QueryString["str"].ToString();
//when i use like this object referene not set to an instance of an object error will eccor how can i solve this.
Thank u

krithika muthukrishnan · Answer

hai when i pass the two querystring values one from default.aspx and then anotehr from first.aspx i retrieve these two query string values from the same first.aspx.cs page it accepts only one querystring value.it shows null for another one. here i attached my codings..

Shankey · Answer

hi You can do like as shown below which defines a getter for your str variable private String Str { get { if (Request.QueryString[str] != null && Convert.ToString( Request.QueryString[str]) != String.Empty) { return Convert.ToString(Request.QueryString[str]); } else { return String.Empty; } } }

Subhendu De · Answer

Check before assigning to it. in first.aspx.cs string str1 if(Request.QueryString[str]!=null) str1=Request.QueryString[str].ToString(); I would prefer to use Convert.ToString() rather than ToString().