Error cannot convert string[] to string

Hi,

I'm getting an error that says " Cannot convert string[] to string " 

My data in the database for the commitID field looks like this:

CommitID 
29384484, 35283847, 44757583
48475739
85757573, 95857374
75757573

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...but, my dropdown list has the list as a string[]:

29384484
35283847
44757583
48475739
85757573
95857374
75757573

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My dropdown list is on the search page to filter the data but I'm not getting any data right after the commitID code not able to filter the data:

if (model.SelectedCommitID != null)
   list = list.Where(x => x.CommitID.Contains(model.SelectedCommitID));    //I get an error here that says "cannot convert string[] to string"

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I tried any() or put the model.SelectedCommitID in a list but it did not work either. These are all my failing trials:

//Filter Commit ID
// if (model.SelectedCommitID != null)
//   {
//     List<string> stringlist = new List<string>();
//   stringlist.Add(model.SelectedCommitID.ToString());
// list = list.Where(x => x.CommitID.Contains(stringlist.ToString()));
// }


//   list = list.Where(x => x.CommitID.Contains(model.SelectedCommitID));   (Did not work)
//list = list.Where(x => x.CommitID.Contains(model.SelectedCommitID.ToString()));     (Did not work) 
//list = list.Where(x => model.SelectedCommitID.Any(m => Equals(x.CommitID.ToString(), m)));     (Did not work)
//list = list.Where(x => x.CommitID.Contains(model.SelectedCommitID.ToString()));    (Did not work)

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