m_objCon = new SqlConnection("datasource=10.69.0.13;userid=sa;password=sa");

m_objCon.Open();

m_objCmd = m_objCon.CreateCommand();

m_objCmd.CommandText = strSql;

m_objCmd.Parameters.Clear();

if (txtUserID.text == null)

{

        m_objCmd.Parameters.Add("@paraUserID", System.DBNull.Value);

}

else

{

        m_objCmd.Parameters.Add(("@paraUserID", txtUserID.text);

}

SqlDataAdapter

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