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Editorial Team
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Asked: 2026-06-17T21:19:48+00:00

I have a page with a nested Gridview where I’m trying to fill the

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I have a page with a nested Gridview where I’m trying to fill the inner grid by pulling a string value from each line of the outer grid. When I try to pass the value from the outer grid to the string variable I get the “Error when converting ‘String’ to ‘System.IFormatProvider'” error. I’m using the following code to store the gridview cell value to the variable:

 Dim Svc_Name As String = grdOuterGridView.DataKeyNames(e.Row.RowIndex).ToString("THIRD_PARTY_SERVICE")

Can anyone tell me what I’m doing wrong here? Thanks.

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1 Answer

  1. Editorial Team

    The DataKeysNames is already an array of string, you don’t need the ToString(….) part.

     Dim Svc_Name As String = grdOuterGridView.DataKeyNames(e.Row.RowIndex)

    Actually your error comes from the ToString(“THIRD_PARTY_SERVICE”). The ToString() override that takes one parameter requires an object that implements IFormatProvider interface, but of course a string doesn’t have this interface, thus the error. However, calling ToString() on a String has no effect as you can read from the MSDN docs

    Returns this instance of String; no actual conversion is performed.

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