How Do I Avoid Getting An Error Message When Using Checkstate In My Class

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C#

SQL

am creating a class to check the items on the checklistbox base on the data in the db.
but am getting the error 'the name "ChechState" does not exist in the current context'
please help me out

public void getMinistry(ref System.Windows.Forms.CheckedListBox cr, string strID)
{
SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]);
conn.ConnectionString = "Data Source=USER-PC;Initial Catalog=PIWCDB;User ID=sa;Password=mike";
conn.Open();

SqlCommand cmd = new SqlCommand();
string sqlQuery = null;
sqlQuery = "SELECT Ministryname FROM tblMembershipministry WHERE FormattedMembershipid ='" + strID + "'";

cmd.Connection = conn;
cmd.CommandText = sqlQuery;
cmd.CommandType = System.Data.CommandType.Text;

System.Data.SqlClient.SqlDataReader dr = null;
dr = cmd.ExecuteReader();

while (dr.Read())
{
cr.SetItemCheckState(cr.Items.IndexOf(dr["Ministryname"]), CheckState.Checked);
}

cmd.Dispose();
}