How u store value in global variable

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C#

Dear i m using login panel for different department .

Master admin than Department Using . there are one designation Section Like Level one , Level two , level three .

when i login than store value from data base but problem is this . when new form is openning than i m unable to use than login base value from data base.

con.open();
SqlCommand str = new SqlCommand("Select * from Admin where LoginId = '"+LoginId.text.toString +"' ",con);
SqlAdapter adp = new SqlAdapter(str);
DataTable dt = new DataTable(asp);
con.close();

here i want stor Levele Id , Name Of Employee One Id On The base of LoginId in New Form .