Input string was not in a correct format.

Hi

you can use Below Code.

using that you can parse the any value.

int id
int.TryParse(Request.QueryString["@ID"].ToString(), out id);

What it is complaining about is that your Request.QueryString is not a valid integer - you will have to look at the vlaue you are passing to the Parse method to work out why - we don't know what is in your data.

Use the debugger - put a breakpoint on teh line and examine the variables - or output it to a label instead so you can see it.

hi I think you not used @ in below redirect page

Response.Redirect("zz.aspx?ID="xx");

and in this page you have given ur procedure paramter to querystring

request.querystring["ID"].ToString();

Hi,

Example:

Response.Redirect("DisplayPage.aspx?ID=" + "12345");

In your DisplayPage change:

int id = Convert.ToInt32(Request.QueryString["@ID"].ToString());.

with

int id = Convert.ToInt32(Request.QueryString["ID"].ToString());.

Regards,

Hi,

Make it simple code:
Example:

int id = Convert.ToInt32(Request.QueryString["ID"].ToString());
         DataTable dt = new DataTable();
         cmd.CommandType = CommandType.StoredProcedure;
         cmd.Parameters.Add("@ID", SqlDbType.Int).Value = id;
         try
         {
             using (conn = new SqlConnection(con))
             {
                 SqlDataAdapter da = new SqlDataAdapter("ups_JoinRegistrationAll", conn);
                 da.Fill(dt);
                 da.Dispose();
             }
         }
         catch (Exception ex)
         {
             throw ex;
         }
         dlProfile.DataSource = dt;
         dlProfile.DataBind();
         cmd.Dispose();

Hope this could help...

Regards,

use this code

int id = Convert.ToInt32(Request.QueryString["@ID"].ToString());
SqlCommand cmd = new SqlCommand();
SqlParameter param = new  SqlParameter;
param.parameterName="@ID";
param.value=id;
con.Open();
cmd.connection=con;
cmd.commandText="ups_JoinRegistrationAll"
cmd.CommandType = CommandType.StoredProcedure;
cmd.parameters.add(param);
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
dlProfile.DataSource = dt;
dlProfile.DataBind();
con.Close();
cmd.Dispose();

I think the variable query string should not have the @ symbol

OR

The value passed to the variable in Query String is not being passed as an integer

You have 2 issues here.
1) The name of your field in the querystring would be better written without the @ symbol.
2) If the querystring argument specified does not exist, then it returns an empty string which is an invalid format for the Convert.ToInt32 method.

To fix this, wrap the querystring argument retrieval like this.

int id;
if( Request.QueryString["ID"] != null )
{
    if( !Int32.TryParse( Request.QueryString["ID"].ToString(), out id )
        id = 0;
}
else
{
    id = 0;
}

Your call would look something like http://www.YourSite/YourPage.aspx?ID=100
If someone accidentally uses something like http://www.YourSite/YourPage.aspx?ID=100 then the code above will still work.

Response.Redirect("myPage.aspx?ID=");