clear data in a dataset table

Hi Experts
I have dataset  DS filled with  data form 2 tables tablename1,tablenameRef
            Fmsadapter.Fill(dS, tableName)
            REFadapter.Fill(dS, tableNameRef)
I would like to clear data of only one table called  tablenameRef everytime I Keydown a textbox.

The following command clear all the data.
dS.Tables.Clear()
Please help
Thanks
b001Asked:
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Carl TawnConnect With a Mentor Systems and Integration DeveloperCommented:
That would suggest that there isn't a table in your dataset with that name then. Use the following to check for the tables existence before trying to clear it:
If dS.Tables.Contains(tableNameRef) Then
    dS.Tables(tableNameRef).Clear()
End If

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Carl TawnSystems and Integration DeveloperCommented:
You need to call Clear() on the datatable itself, rather than the dataset:
dS.Tables(tableNameRef).Clear()

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Fernando SotoRetiredCommented:
Hi  b001;

The sample code will clear the Table tablenameRef of its data every time a key is pressed while TextBox1 has focus.

    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged

        ds.Tables("tablenameRef").Clear()

    End Sub

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Fernando
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Fernando SotoRetiredCommented:
@ carl_tawn;

You need quotes around the table name.
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Carl TawnSystems and Integration DeveloperCommented:
tableNameRef in the original posted is unqouted, which would suggest it is a variable rather than the name of the table itself, hence no quotes.
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b001Author Commented:
tableNameRef is veraible.
I tried the following codes and I have error


            dS.Tables(tableNameRef).Clear()
            dS.Tables("tableNameRef").Clear()
            dS.Tables(" & tableNameRef & ").Clear()

eror:
Object reference not set to an instance of an object.
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Fernando SotoRetiredCommented:
Hi b001;

You can use a numeric index. For example if tableNameRef was loaded into the DataSet object as the second table then the code in the snippet will work. If it was the first table loaded then change (1) to (0) in the code snippet.

    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged

        ds.Tables(1).Clear()

    End Sub

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