DataGridView / get bound table name?

you may try this;

YourDataGridView.DataMember

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OR

Dim src As BindingSource = YourDataGridView.DataSource
        MessageBox.Show(src.DataMember)

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Ryan,
first method returns ""

second one gives this error:
Unable to cast object of type 'System.Data.DataTable' to type 'System.Windows.Forms.BindingSource'.

MsgBox(CType(DataGridView1.DataSource, DataTable).TableName)

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returns ""

Complete solution for datagrid binded to bindingsource/dataset/datatable (not supporting LINQ classes)

Private Function GetBoundTableName(dgv As DataGridView) As String
    If dgv.DataSource Is Nothing Then Return ""
    Dim dt As DataTable = Nothing
    If TypeOf dgv.DataSource Is DataTable Then
        dt = CType(dgv.DataSource, DataTable)
    ElseIf TypeOf dgv.DataSource Is DataSet Then
        dt = GetDsDataTable(CType(dgv.DataSource, DataSet), dgv.DataMember)
    ElseIf TypeOf dgv.DataSource Is BindingSource Then
        dt = GetBsDataTable(CType(dgv.DataSource, BindingSource))
    End If
    If dt Is Nothing Then Return ""
    Return dt.TableName
End Function
'Get datatable binded to bindingsource
Private Function GetBsDataTable(ByVal bs As BindingSource) As DataTable
    If TypeOf bs.DataSource Is DataTable Then Return CType(bs.DataSource, DataTable)
    Return GetDsDataTable(GetBsDataSet(bs), bs.DataMember)
End Function
'Get dataset binded to bindingsource
Private Function GetBsDataSet(ByVal bs As BindingSource) As DataSet
    If TypeOf bs.DataSource Is DataSet Then Return CType(bs.DataSource, DataSet)
    If TypeOf bs.DataSource Is BindingSource Then Return GetBsDataSet(CType(bs.DataSource, BindingSource))
    Return Nothing
End Function
'Get datatable in dataset (either as table or relation)
Private Function GetDsDataTable(ds As DataSet, tableName As String) As DataTable
    If ds Is Nothing OrElse tableName = "" Then Return Nothing
    If ds.Tables.Contains(tableName) Then Return ds.Tables(tableName)
    If ds.Relations.Contains(tableName) Then Return ds.Relations(tableName).ChildTable
    Return Nothing
End Function

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still getting ""
And I am binding a DataTable. Just like this DataGridView1.DataSource = dt

MsgBox(CType(DataGridView1.DataSource, DataTable).TableName)

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that posted by Ark should get the name you wanted.

make sure before you bind your DataTable to your DataGridView, you got set its TableName accordingly?

like:

Dim dt As New DataTable
        dt.TableName = "test 123"
        dt.Columns.Add("ID", GetType(Integer))
        dt.Columns.Add("Name", GetType(String))
        dt.Columns.Add("Date", GetType(DateTime))

        dt.Rows.Add(1, "John", DateTime.Now)
        dt.Rows.Add(2, "Peter", DateTime.Now)

        DataGridView1.DataSource = dt