Error while Conversion.

Getting Error in this Coloured Line....

 

"An exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll but was not handled in user code

Additional information: Conversion failed when converting the varchar value '[email protected]' to data type int."

 

public bool IsUserExist(string Emailid)

{

bool flag = false;

SqlConnection connection = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["ConString"].ConnectionString);

connection.Open();

SqlCommand command = new SqlCommand("select count(*) from Register where UserID = '" + Emailid + "'", connection);

flag = Convert.ToBoolean(command.ExecuteScalar());

connection.Close();

return flag;

}

 

If there's a solution please send me the answers....