Using Oracle bind variable of more than 32K characters in ASP.NET

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ASP.NET

Oracle

I have a C# program that requires to make a comparison of a CLOB data-type with a backend Oracle 11gR2 database.
The following is my code

cmd.Text = SELECT COUNT(*) FROM TEST_TABLE t1 WHERE DBMS_LOB.COMPARE(t1.CLOB_COLUMN, :INPUT_TEXT);
OracleParameter oraPara = new OracleParameter("INPUT_TEXT", OracleType.Clob);
OraPara.Value = txtBox1.Text; //Text Box can have more than 32K characters
cmd.Parameters.Add(oraPara);
int i = cmd.ExecuteScalar();

I got the error if the number of characters in the TextBox is more than 32K:

ORA-01460 unimplemented or unreasonable conversion requested

How can I overcome this?