Load Gridview row with data from Dataset

Hi, I have a gridview to which i am adding rows dynamically at the click event of a button placed in gridview footer template. When i want to update data. I have to load the gridview with all the rows required. I get the sql table data in the dataset object and then i have to load this in the gridview. How can i do this?  Only one row gets loaded when i use this code:   DataSet DSContact = DMLObj.Load_DataSet("Usp_LoadData", "ContactPerson", idf);   foreach (GridViewRow row in GVContactPerson.Rows)   {     ((TextBox)row.FindControl("txtContactName")).Text=DSContact.Tables[0].Rows[0]["ContactName"].ToString();   ((TextBox)row.FindControl("txtemail")).Text = DSContact.Tables[0].Rows[0]["ContactEmailID"].ToString();   ((TextBox)row.FindControl("txtmob1")).Text = DSContact.Tables[0].Rows[0]["ContactMobile"].ToString();   Session["contact"] = ((TextBox)row.FindControl("txtContactName")).Text;   string pid = Convert.ToString(DMLObj.getid("Select ContactPersonID from tbl_ContactPersonDetails where ContactName='" + Session["contact"].ToString() + "'"));   Session["contactID"] = pid;   }