Cannot implicitly convert type 'bool' to 'string'

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C#

ASP.NET

Hello ,

I want to particular date data i write some code and also iam using sql server 2008
the column type rdate=datetime some i am given the date in one textbox the textbox
date data can be display the gridview but here is the some error so please help me
i am given the source code

string dateString = TextBox6.Text; // <-- Valid
            string format = "ddd dd MMM h:mm tt yyyy";
            DateTime dateTime;
            TextBox6.Text = DateTime.TryParseExact(dateString, format, CultureInfo.InvariantCulture, DateTimeStyles.None, out dateTime);
            SqlConnection con = new SqlConnection("Data Source=NSYS1\\SQLEXPRESS;Initial Catalog=agfl;connect timeout=30;Integrated Security=True");
            con.Open();
            string strQuery = "select * from stf where  rdate =@some";
            SqlCommand cmd = new SqlCommand(strQuery, con);
            cmd.CommandType = CommandType.Text;
            TextBox6.Text = TextBox6.Text.Trim();
            cmd.Parameters.AddWithValue("@some", TextBox6.Text);
            SqlDataAdapter sda = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            sda.Fill(dt);
            gvuser.DataSource = dt;
            gvuser.DataBind();
            con.Close();