C# Oracle SQL Parameter binding to variable? - c#

I want to bind a variable in a c# oracle SQL parameter. But it doesn't bind. I checked the return from the messagebox, but I still can't get the variable value. If you comment the adapter part, an error appears.
string sql = "SELECT * FROM ITSTEMP WHERE TO_CHAR(WEEK,'YYYYMMDD') = :DTTM";
OracleDataAdapter adapter = new OracleDataAdapter(sql, DBHelper.DBConn);
DataTable date_table = new DataTable();
adapter.SelectCommand.Parameters.Add(new OracleParameter("DTTM", dateTimePicker3.Text));
MessageBox.Show(sql);
try
{
adapter.Fill(date_table);
dataGridView1.DataSource = date_table;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
enter image description here
string sql = "SELECT * FROM ITSTEMP WHERE TO_CHAR(WEEK,'YYYYMMDD') = :DTTM";
OracleDataAdapter adapter = new OracleDataAdapter(sql, DBHelper.DBConn);
DataTable date_table = new DataTable();
//adapter.SelectCommand.Parameters.Add(new OracleParameter("DTTM", dateTimePicker3.Text));
MessageBox.Show(sql);
try
{
adapter.Fill(date_table);
dataGridView1.DataSource = date_table;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
enter image description here
How do I bind?

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private void cboMake_SelectedIndexChanged(object sender, EventArgs e)
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You access here cboModel, which is not that one whom item was actually selected. At least lookin on event name cboMake_SelectedIndexChanged, seems to me that you should look on cboMake selected index.
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