assigning text by finding control

Question

I am trying to assign text to a label by finding a control (textbox) on previous page. The control is accurately found, but the text cannot be assigned. Intellisense does not show "Text" property. How to get the text?

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Control ctContent = this.PreviousPage.Master.FindControl("MainContent");
            Control ct = (TextBox) ctContent.FindControl("TextBox1");
            //TextBox t = (TextBox) Page.PreviousPage.Master.FindControl("TextBox1");
            Label1.Text = String.Format("This is what you wrote there: {0}",ct.??????);
        }     
    }

Answer 1

Instead

Control ct = (TextBox) ctContent.FindControl("TextBox1");      

just write

TextBox ct = (TextBox) ctContent.FindControl("TextBox1");