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how to add x y point to existing layer in arcgis in c#.net

Hello every one

I have : ArcGis 9.3 Desktop ,ArcSde 9.2 , VS.net 2010 , sql server 2008

now I have an mxd project , this project I have map  which on it I have a layer for projecting points
the first time I entered the points used the arcmap from tools>add xy data and so on I imported the coordinates .

now I want to make some kind of web form useing asp.net , to enter the X Y to the table of the points and then a point will appear on the map for each record entered

I need your help for guiding me where to start and which tools should I use
and if there any step by step tutorials

thanks in advance
1 Solution
palservAuthor Commented:
any idea please ?
Open Arc Catalog , then open your project, Do you have a geoedatabase or just the MXD which is a list of short cuts to your files. While in ARC catalog you will make a new shape (POINT) file. If you have a geodatabase import that point file into your geodatabase.  Close ARC Catalog and open ARCMAP. open you mxd and add the point file you made if you do not have geodatabase.  If you have a geodatabase you will not have to iadd it because you did it in ARC Catalog.  Now open spread sheet software.  If you have a list of the coordinates in a text file you can import them or you can make a spread sheet.  Now go to tools and iadd xy data., make sure your target file is you point file you made.  import you text file or spread sheetis
Make sure the coordinates are in the format 31/07/30  91/22/00 or 31.125 91.375
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