How to insert symbols (Alt+Code) in a table and retreive them as is.

I want to insert it as:-
INSERT INTO MyTable VALUES('♣');

As well as I tried with StringToBinary, and BinaryToString, byte array but nothing worked.
private void ButtonShow_Click(object sender, EventArgs e)
{
try
{
string s1 = "♣";
s = StringToBinary(s1);
s = BinaryToString(s); //Not working here
cnn = new SqlConnection(connetionString);
cnn.Open();
string sql = "Insert into EDTable (RText) values ('♣≈Ω°±Σⁿ')";
cmd = new SqlCommand(sql, cnn);
cmd.ExecuteNonQuery();
da = new SqlDataAdapter("Select * from EDTable", connetionString);
da.Fill(ds);
dataGridView1.DataSource = ds.Tables[0];

}
catch (Exception ex) { }
finally
{
cmd.Dispose();
cnn.Close();
this.Close();
}
}
public static string StringToBinary(string data)
{
StringBuilder sb = new StringBuilder();
foreach (char c in data.ToCharArray())
{
sb.Append(Convert.ToString(c, 2).PadLeft(8, '0'));
}
return sb.ToString();
}
public static string BinaryToString(string data)
{
List<byte> byteList = new List<byte>();
for (int i = 0; i < data.Length; i += 8)
{
byteList.Add(Convert.ToByte(data.Substring(i, 8), 2));
}
return Encoding.ASCII.GetString(byteList.ToArray());
}