Retrieving values of datagrid on another page

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SQL-Server-2005

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I am trying to pass values from gridView of one page to a textbox of another page
I have written following code
On first page:

C#

foreach (GridViewRow row in dgvSearchResults.Rows)
       {
           string name = row.Cells[1].Text;
           string time = row.Cells[2].Text;
           Response.Redirect("EmpDetails.aspx?name=" + name.ToString());
       }

on second page:

this.txtPatientName.Text = Request.QueryString["name"].ToString();

When I am trying this to do,I am getting following error:

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. 
Source Error:
Line 108:     protected void Page_Load(object sender, EventArgs e)
Line 109:     {
Line 110:         this.txtName.Text = Request.QueryString["name"].ToString();
Line 111:     }
Line 112: }

Where is the problem?
What should i need to do to solve this?

Posted 29-Apr-12 18:29pm

codeBegin

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Sandeep Mewara 30-Apr-12 1:10am

<pre lang="cs">foreach (GridViewRow row in dgvSearchResults.Rows)
{
string name = row.Cells[1].Text;
string time = row.Cells[2].Text;
Response.Redirect("EmpDetails.aspx?name=" + name.ToString());
}</pre>
Any idea on how the above code works or what the execution is here? I would suggest you to put a DEBUG point and see. Not a correct way of writing code. DEBUG the execution and share what you observe.

2 solutions

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Prasad_Kulkarni · Accepted Answer · 2012-04-29T18:31:00

Solution 1

Try this code on second page:

C#

if (Request.QueryString["name"]!=null && !string.IsNullOrEmpty(Request.QueryString["name"].ToString()))
{
    this.txtName.Text = Request.QueryString["name"].ToString();
}

Or else have a look here[^]

Posted 29-Apr-12 18:31pm

Prasad_Kulkarni

Updated 29-Apr-12 18:34pm

v3

Comments

Sandeep Mewara 30-Apr-12 1:02am

This answer is just to handle the error. We should always check possible null-reference before using it. Agreed. But, this will not solve OP's problem here.

Deepak_Sharma_ · Accepted Answer · 2012-04-29T18:58:00

Solution 2

You can use Cross-Page Posting to access DataGrid value in another page. Have a look:
msdn.microsoft.com/en-us/library/ms178139.aspx

Posted 29-Apr-12 18:58pm

Deepak_Sharma_