How to pass FormView textbox value from one page to another .aspx

In FormView have textbox with some value. How can I take that value (text) from one page (Default.aspx) and pass it to another (Default2.aspx). On Default2 I need to use this value to populate gridview with some other data. Example:
textbox.text = "something"
I need to pass "something" to
Default2.aspx and use it for gridview as select * from sql_table where something="something".

Thanks for helping.
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you can pass it through

1. Query String
2. Session

If you are going for sessions, do it like this
In Default.aspx
textbox.text = "something"
Session["value"] = textbox.text

In Default2.aspx
string value = Session["value"].ToString()

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ASP.NET provides various options for state management in web applications.
Query String
Hidden Fields ( Viewstate)
Cookies (Client side)

Based on your needs, you can choose either of the options. Check out below links:
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