How to pass value from imput control in a Web Form to a Variabe ???

[alexnikolof]

Hi,
the problem is to pass the string value from a FormView Control or SqlDataSource Parameter to a Variable in order to get the name of a file to delete?
Scenario 1 traing to retrive the value from a hidden Field in a FormView1
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Protected Sub DeleteButton_Click(ByVal sender As Object, ByVal e As System.EventArgs)

Dim path As String
path = FormView1.Controls("s_file").ToString ' ????? does not work ?
File.Delete(path)
End Sub
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Scenario 2 traing to get the value from SqlDataSource Parameter
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Protected Sub DeleteButton_Click(ByVal sender As Object, ByVal e As System.EventArgs)

Dim s_file As System.Data.SqlClient.SqlParameterCollection ' ? Not wrk ?
s_file = SqlDataSporce1.DeleteParameter("s_file").ToString
File.Delete(s_file)
End Sub
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Houwever the point is to pass the value from a FormView Control to a variable or from data source parameter to a variable to the path variable for a delete file function. ( The string from the databse contains the pat and the file name - "~/Upload/logo.jpg").
May be I can use the name of a hidden Field named "s_file", where I have the value of the String directly ??? It does not work ???? even using Request.Form or Request.QuerySting ????
Please Help it is a strategic question, Very important !!!!