How to use tcga database for lncrna analysis of differences?

DataTable dt = new DataTable()

; Dt. Columns.Add(new DataColumn("PreRevDate0", typeof(decimal)))

; col. ColumnName = "PreRevDate1"

; col. DataType = typeof(decimal)

; dt.Columns.Add (col)

;D ataRow dr = dt. NewRow()

; dr["PreRevDate0"] = -1; Dt. Rows.Add(dr);