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private void Form1_Load(object sender, EventArgs e)
{
   var data = new[]  { new { id = 1, value = 29 }, new { id = 2, value = 32 } };

   comboBox1.ValueMember = "value";
   comboBox1.DisplayMember = "id";
   comboBox1.DataSource = data;
}

private void comboBox1_SelectedValueChanged(object sender, EventArgs e)
{
    if (comboBox1.SelectedValue != null)
    {
        int value = (int)comboBox1.SelectedValue;
    }
}					

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 var lvl_kaserne = new[] 
                { 
                    new {id = 1, value = 1},
                    new {id = 2, value = 0.59},
                    new {id = 3, value = 0.56},
                    new {id = 4, value = 0.53},
                    new {id = 5, value = 0.50},
                    new {id = 6, value = 0.47},
                    new {id = 7, value = 0.44},
                    new {id = 8, value = 0.42},
                    new {id = 9, value = 0.39},
                    new {id = 10, value = 0.37},
                    new {id = 11, value = 0.35},
                    new {id = 12, value = 0.33},
                    new {id = 13, value = 0.31},
                    new {id = 14, value = 0.29},
                    new {id = 15, value = 0.28},
                    new {id = 16, value = 0.26},
                    new {id = 17, value = 0.25},
                    new {id = 18, value = 0.23},
                    new {id = 19, value = 0.22},
                    new {id = 20, value = 0.21},
                    new {id = 21, value = 0.20},
                    new {id = 22, value = 0.19},
                    new {id = 23, value = 0.17},
                    new {id = 24, value = 0.16},
                    new {id = 25, value = 0.16}
                };
                stufe_kaserne.ValueMember = "value";
                stufe_kaserne.DisplayMember = "id";
                stufe_kaserne.DataSource = lvl_kaserne;
                var kaserne = Convert.ToDecimal(stufe_kaserne.SelectedValue);