Data Return Corp Watch

from SC 13G/A 1 page <page> Exhibit 1 Joint Filing Agreement in Accordance With Rule 13d-1(k) Under the Securities Exchange Act of 1934, the Persons Named Below Agree to the Joint Filing on Behalf of Each of Them of a Statement on Schedule 13g (Including Amendments Thereto) With Respect to the Common Stock of Data Return Corporation and Further Agree That This Joint Filing Agreement Be Included as an Exhibit to Such Joint Filings. in Evidence Thereof Each of the Undersigned, Being Duly Authorized, Hereby Execute This Agreement on the Date Set Forth Opposite His or Her Name. Date: February 12, 2001 /S/ Sunny C. Vanderbeck Sunny C. Vanderbeck Date: February 12, 2001 Dcr Technology Fund I, Ltd. By: /S/ Sunny C. Vanderbeck Sunny C. Vanderbeck, General Partner Page 8 of 8 Pages

from SC 13G/A 1 page <page> Exhibit 1 Joint Filing Agreement in Accordance With Rule 13d-1(k) Under the Securities Exchange Act of 1934, the Persons Named Below Agree to the Joint Filing on Behalf of Each of Them of a Statement on Schedule 13g (Including Amendments Thereto) With Respect to the Common Stock of Data Return Corporation and Further Agree That This Joint Filing Agreement Be Included as an Exhibit to Such Joint Filings. in Evidence Thereof Each of the Undersigned, Being Duly Authorized, Hereby Execute This Agreement on the Date Set Forth Opposite His or Her Name. Date: February 12, 2001 /S/ Michelle R. Chambers Michelle R. Chambers Date: February 12, 2001 Ohg Technology, Ltd. By: /S/ Michelle R. Chambers Michelle R. Chambers, General Partner

from SC 13D/A 1 page <page> Schedule 13d <table> <caption> <s> <c> - Cusip No. 23785m 10 5 Page ___6___ of 6 Pages - </Table> Exhibit 1 Joint Filing Agreement in Accordance With Rule 13d-1(k) Under the Securities Exchange Act of 1934, the Persons Named Below Agree to the Joint Filing on Behalf of Each of Them of a Statement on Schedule 13d (Including Amendments Thereto) With Respect to the Common Stock of Data Return Corporation and Further Agree That This Joint Filing Agreement Be Included as an Exhibit to Such Joint Filings. in Evidence Thereof Each of the Undersigned, Being Duly Authorized, Hereby Execute This Agreement on the Date Set Forth Opposite His or Her Name. Date: December 8, 2000 /S/ Nathan Landow Nathan Landow Date: December 8, 2000 Nathan Landow Family Limited Partnership By: Nathan Investments, Inc., Its General Partner By: /S/ Nathan Landow Nathan Landow, President

from SC 13D 1 page <page> Schedule 13d Cusip No. 23785m 10 5 Page ___6___ of 6 Pages - Exhibit 1 Joint Filing Agreement in Accordance With Rule 13d-1(k) Under the Securities Exchange Act of 1934, the Persons Named Below Agree to the Joint Filing on Behalf of Each of Them of a Statement on Schedule 13d (Including Amendments Thereto) With Respect to the Common Stock of Data Return Corporation and Further Agree That This Joint Filing Agreement Be Included as an Exhibit to Such Joint Filings. in Evidence Thereof Each of the Undersigned, Being Duly Authorized, Hereby Execute This Agreement on the Date Set Forth Opposite His or Her Name. /S/ Nathan Landow Date: August 9, 2000 Nathan Landow Date: August 9, 2000 Nathan Landow Family Limited Partnership By: Nathan Investments, Inc., Its General Partner By: /S/ Nathan Landow Nathan Landow, President

from SC 13G 1 page <page> Exhibit 1 Joint Filing Agreement in Accordance With Rule 13d-1(k) Under the Securities Exchange Act of 1934, the Persons Named Below Agree to the Joint Filing on Behalf of Each of Them of a Statement on Schedule 13g (Including Amendments Thereto) With Respect to the Common Stock of Data Return Corporation and Further Agree That This Joint Filing Agreement Be Included as an Exhibit to Such Joint Filings. in Evidence Thereof Each of the Undersigned, Being Duly Authorized, Hereby Execute This Agreement on the Date Set Forth Opposite His or Her Name. /S/ Nathan Landow Date: February 11, 2000 Nathan Landow Date: February 11, 2000 Nathan Landow Family Limited Partnership By: Nathan Investments, Inc., Its General Partner By: /S/ Nathan Landow Nathan Landow, President Page 8 of 8 Pages

from SC 13G 1 page <page> Exhibit 1 Joint Filing Agreement in Accordance With Rule 13d-1(k) Under the Securities Exchange Act of 1934, the Persons Named Below Agree to the Joint Filing on Behalf of Each of Them of a Statement on Schedule 13g (Including Amendments Thereto) With Respect to the Common Stock of Data Return Corporation and Further Agree That This Joint Filing Agreement Be Included as an Exhibit to Such Joint Filings. in Evidence Thereof Each of the Undersigned, Being Duly Authorized, Hereby Execute This Agreement on the Date Set Forth Opposite His or Her Name. Date: February 11, 2000 /S/ Michelle R. Chambers Michelle R. Chambers Date: February 11, 2000 Ohg Technology, Ltd. By: /S/ Michelle R. Chambers Michelle R. Chambers, General Partner Page 8 of 8 Pages

from SC 13G 1 page <page> Exhibit 1 Joint Filing Agreement in Accordance With Rule 13d-1(k) Under the Securities Exchange Act of 1934, the Persons Named Below Agree to the Joint Filing on Behalf of Each of Them of a Statement on Schedule 13g (Including Amendments Thereto) With Respect to the Common Stock of Data Return Corporation and Further Agree That This Joint Filing Agreement Be Included as an Exhibit to Such Joint Filings. in Evidence Thereof Each of the Undersigned, Being Duly Authorized, Hereby Execute This Agreement on the Date Set Forth Opposite His or Her Name. Date: February 10, 2000 /S/ Sunny C. Vanderbeck Sunny C. Vanderbeck Date: February 10, 2000 Dcr Technology Fund I, Ltd. By: /S/ Sunny C. Vanderbeck Sunny C. Vanderbeck, General Partner Page 8 of 8 Pages

from S-1/A ~20 pages Form of Underwriting Agreement