How to pass textbox value to .rdlc?

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VS2008

C#

Visual-Studio

reporting

Hi, there!
i just want to ask..
How am i going to pass the value of text box in the .rdlc
-i have searched some codes that saying using parameters and adding some codes to the form, but i get an error

private void button1_Click(object sender, EventArgs e)
   {
       this.reportViewer1.LocalReport.ReportEmbeddedResource = "Report1.rdlc";

       ReportParameter rp = new ReportParameter("ApplicationUser", this.textBox1.Text);
       this.reportViewer1.LocalReport.SetParameters(new ReportParameter[] { rp });
       this.reportViewer1.RefreshReport();



   }

i also add parameters in textbox in reportviewer
=Parameters!ApplicationUser.Value

but i get this error:
Error 1 The report parameter ‘content’ has a DefaultValue or a ValidValue that depends on the report parameter “content”. Forward dependencies are not valid. C:\Thesis\texvox\texvox\Report1.rdlc texvox

--content is the parameter name..

hope someone can help.. thank u very much in advance!