Failed to convert parameter value from a Guid to a String

Posted by user320460 on Stack Overflow See other posts from Stack Overflow or by user320460
Published on 2010-04-20T12:01:59Z Indexed on 2010/04/20 12:13 UTC
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Filed under:

datatable

|

guid

|

convert

|

string

|

c#

Hello,

I am at the end of my knowledge and googled for the answer too but no luck :/

Week ago everything worked well.

I did a revert on the repository, recreated the tableadapter etc... nothing helped.

When I try to save in my application I get an SystemInvalidCastException at this point:

PersonListDataSet.cs:

partial class P_GroupTableAdapter
{
    public int Update(PersonListDataSet.P_GroupDataTable dataTable, string userId)
    {
        this.Adapter.InsertCommand.Parameters["@userId"].Value = userId;
        this.Adapter.DeleteCommand.Parameters["@userId"].Value = userId;
        this.Adapter.UpdateCommand.Parameters["@userId"].Value = userId;

        return this.Update(dataTable); **<-- Exception occurs here**
    }
}

Everything is stuck here because a Guid - and I checked the datatable preview with the magnifier tool its really a true Guid in the column of the datatable - can not be converted to a string ??? How can that happen?

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