C# Error Displaying The Xml Element in DataGridView -

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the purpose of code reading xml elements , display every element under related column name in datagridview.

so, here have code:

            ienumerable<xelement> tables = xelement.elements(df + "table");             foreach (xelement table in tables)             {                 //get name tablename node                 xelement tablenamenode = table.element(df + "tablename");                 tbtablename.text = tablenamenode.value.tostring();                 xelement numberrows = table.element(df + "numberofrows");                 tbnumrows.text = numberrows.value.tostring();                 string tablename = tablenamenode.value;                  tabledata td = new tabledata(currentproject.currentschema.findtable(tablename));                 td.populatefielddata();                // tabledatalist.trygetvalue(tablename, out td);                 tabledatalist.add(tablename, td);                 //if open project after save or open it, exception throws: added key!                   ienumerable<xelement> fields = table.elements(df + "field");                 foreach (xelement field in fields)                 {                     xelement fieldnamenode = field.element(df + "name");                     string fieldname = fieldnamenode.value;                     fielddata fd = td.fieldlist[fieldname];                      ienumerable<xelement> fieldprops = field.descendants();                     foreach (xelement fieldprop in fieldprops)                     {                         string fieldpropertyname = fieldprop.name.tostring();                         if (fieldpropertyname == "name")                         {                             fd.name = fieldprop.value;                         }                          if (fieldpropertyname == "type")                         {                             fd.datatype = fieldprop.value;                         }                          if (fieldpropertyname == "size")                         {                             int = 0;                             int.tryparse(fieldprop.value.tostring(), out i);                             fd.size = i;                         }                          if (fieldpropertyname == "nullable")                         {                             if (fieldprop.value.tostring() == "true")                                 fd.nullable = true;                             else                                 fd.nullable = false;                         }                          if (fieldpropertyname == "contentsource")                         {                             fd.contentsource = fieldprop.value;                         }                          if (fieldpropertyname == "constantvalue")                         {                             fd.constantvalue = fieldprop.value;                         }                          if (fieldpropertyname == "randomvalue")                         {                             fd.averagesize = fieldprop.value;                         }                          if (fieldpropertyname == "list")                         {                             fd.picklist = fieldprop.value;                         }                      }                     datagridview1.rows.add(fd.name, fd.datatype, fd.size, fd.nullable);                       string columnname = datagridview1.currentrow.cells[0].value.tostring();                       this.tabledatalist.trygetvalue(tbtablename.text, out td);                     if (td != null)                     {                         td.fieldlist.trygetvalue(columnname, out fd);                     }                     foreach (var fdl in td.fieldlist)                     {                           if (td != null && fd != null)                     {                         if (fd.contentsource == "constant")                         {                             datagridview1.currentrow.cells[4].value = fd.contentsource + "(" + "value= " + fd.constantvalue + ")";                          }                         if (fd.contentsource == "list")                         {                             datagridview1.currentrow.cells[4].value = fd.contentsource + "(" + fd.picklist + ")";                          }                         if (fd.contentsource == "random")                         {                             datagridview1.currentrow.cells[4].value = fd.contentsource + "(" + fd.averagesize + ")";                             }                         }                     }                  }             }

here xml file reading: 

<?xml version="1.0"?>    <generatorxml>    <schemapath>c:\projects\coreschema.xml</schemapath>    <groupname>documents</groupname>      -<table>    <tablename>directory</tablename>    <numberofrows>33</numberofrows>      -<field>    <name>dir_id</name>    <type>number</type>    <size>10</size>    <nullable>false</nullable>    <contentsource>random</contentsource>    <constantvalue> </constantvalue>    <randomvalue>4</randomvalue>    <list> </list>    </field>      -<field>    <name>directory_number</name>    <type>number</type>    <size>5</size>    <nullable>false</nullable>    <contentsource>list</contentsource>    <constantvalue> </constantvalue>    <randomvalue> </randomvalue>    <list>coffee</list>    </field>      -<field>    <name>file_count</name>    <type>number</type>    <size>5</size>    <nullable>false</nullable>    <contentsource>constant</contentsource>    <constantvalue>2</constantvalue>    <randomvalue> </randomvalue>    <list> </list>    </field>      +<field>    </table>    </generatorxml>

when run code, gridview:
gridview

i think loops got problem, can't find it. in advance every thoughts.


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