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how to check if datasource is empty before binding it to gridview in asp.net

Posted on 2009-05-03
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Last Modified: 2012-06-27
Hi

I am using the following code to get the data from database and bind it to gridview.

dim  mySqlString = "Select columname from table where xyz = 1"
Me.Gridview1.DataSource = CType(DataProvider.Instance().ExecuteSQL(mySqlString.ToString(), myParam), IDataReader)
Me.Gridview1.DataBind()

How can check if the query returned no rows before binding it to database.

Thanks



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Question by:Shiva-Kumar
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3 Comments
 
LVL 9

Expert Comment

by:Deathrace
ID: 24290101
try to use a datareader, before binding the datasource of gridview1,hope the below might might give some hint for you.
http://www.adefwebserver.com/DotNetNukeHELP/Misc/code/DynamicForms_DynamicForms_DAL.vb.htm
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LVL 6

Accepted Solution

by:
M3mph15 earned 400 total points
ID: 24292168
Hi,

Yes i agree. Use a datareader first to test. Below is an example connecting to a Oracle database but is easily modified for Sql Server and Access databases (the methods are pretty much the same it's just the control names that will cahnge).

Dim sql as String = "Select columname from table where xyz = 1"
 
Dim _source As String = "Data Source=[name of database];Persist Security Info=True;Password=[password];User ID=[username]" 'Replace [*] with relevant data
 
Dim _conn as new OracleConnection(_source)
Dim command As OracleCommand = _conn.CreateCommand()
command.CommandText = sql
 
Dim reader As OracleDataReader
 
Try
                _conn.Open()
                reader = command.ExecuteReader(CommandBehavior.CloseConnection)
Catch ex As Exception
              _conn.Close()
End Try
 
If reader IsNot Nothing Then
                If reader.HasRows() Then
                              'If it reaches this point then it does return data
 
                Else
                         'Code for record doesn't exist Insert/Update
                End If
                reader.Close()
Else
  'Error Handling for failure to create reader
End If


HTH
-M3mph15
0
 

Author Closing Comment

by:Shiva-Kumar
ID: 31577328
Thanks that worked.
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