Get value from one .Net page to another

See more:

C#

ASP.NET

C#4.0

There is a textbox (id="TextBox1") in Default.aspx page. I want to get the value of the textbox1 from Default2.aspx page

protected void Button1_Click(object sender, EventArgs e)
{

TextBox tb = (TextBox)PreviousPage.FindControl("TextBox1");
if (tb != null)
{
Label1.Text = tb.Text;
}
}
When I click the button it arises an error :


Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 30: //page_load();
Line 31: //Label1.Text = PreviousPage.Name;
Line 32: TextBox tb = (TextBox)PreviousPage.FindControl("TextBox1"); if (tb != null)
Line 33: {
Line 34: Label1.Text = tb.Text;