You can Use Two Methos
1>> Using Session You can pass value from one form to another..
In Form1
Session["Name"] =txtName.Text;
Session["LatName"]=txtLatName.text;
In Form2
string Name = Session["Name"].ToString();
String LastName=Session["LatName"].ToString();
Or You can Use
In Form1;
int StudiID=txtStudio.text;
Response.Redirect("Default.aspx?iStudioID=" + iStudioID);
In Form2
int StudioID = Convert.ToInt32(Request.QueryString["iStudioID"].ToString());