[Solved] Need to search for number combinations within textbox(c#)

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Try this:

string Input = "919982115672";
Console.Write(Search(Input));


public string Search(string Input)
{

    Dictionary<string, string> PreDefinedSearchAndTexts = new Dictionary<string, string>();

    PreDefinedSearchAndTexts.Add("8211", "Hello");
    PreDefinedSearchAndTexts.Add("82", "My name is inigo montya");
    PreDefinedSearchAndTexts.Add("9821", "You killed my father");
    PreDefinedSearchAndTexts.Add("5672", "Prepare to die");

    StringBuilder sb = new StringBuilder(); 

    foreach(string Key in PreDefinedSearchAndTexts.Keys) 
    {
        if(Input.Contains(Key))
        {
            sb.Append(Key).Append(" : ").AppendLine(PreDefinedSearchAndTexts[Key]);
        }
    }
    return sb.ToString();
}

Results:

8211 : Hello
82 : My name is inigo montya
9821 : You killed my father
5672 : Prepare to die

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solved Need to search for number combinations within textbox(c#)