输入的字符串格式不正确?

问题描述

大家好，

执行该代码时出现问题:

Hi every body,

I have problem when execute that code:

using (SqlConnection con = new SqlConnection(connectionString))
        {
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = con;
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = "Loging";
            cmd.Parameters.AddWithValue("@UserName", username);
            cmd.Parameters.AddWithValue("@PassWord", password);
            con.Open();
            int x =Convert.ToInt32(cmd.ExecuteScalar());
            isAuthenticated = x == 1;

        }

它给我以下消息:
输入的字符串格式不正确.


它在这部分代码上标记:
int x = Convert.ToInt32(cmd.ExecuteScalar());


?????????

It give me this message:
Input string was not in a correct format.


It marks on this part of code :
int x =Convert.ToInt32(cmd.ExecuteScalar());


?????????

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