sql - Hide Delete Button in Gridview if RowID links to Foreign Key -

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vb.net - i've found other questions related this, none situation. i'm dealing 2 tables - "task" , "task_run."

i have gridview rows listing "tasks." come "task" table , each task has "tsk_id." want have delete button each task (row) , want delete button visible row if task not have run associated task "task_run" table. (i.e. not want user able delete task if has been run.)

table1 - "task" pky = "tsk_id"

table2 - "task_run" pky = "run_id" fky = "run_tsk_id"

i assume need have template field in gridview , have delete button conditionally show based on whether there rows in run table associated particular task id, stuck on how this. makes sense. appreciated. thanks!

you first task_id task_run table accordingly user if exist otherwise return 0 value , , placed task_id in gridview on label or textbox or hidden field visible=false property if not showing user, use command checking task have run or not user.

  select        ext.* , isnull((select top 1 run_tsk_id  task_run run_tsk_id = ext.tsk_id),0) checkid              task  ext

then use gridview rowdatabound event hide or show delete button conditionally, code as.

  protected sub grid_rowdatabound(sender object, e gridviewroweventargs)     if e.row.rowtype = datacontrolrowtype.datarow         dim lblcheckid label = directcast(e.row.findcontrol("lblcheckid"),label)         dim deletebutton button = directcast(e.row.findcontrol("btndelete"), button)         if cint(lblcheckid.text) > 0             deletebutton.visible = false         else             deletebutton.visible = true         end if     end if end sub

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