Question

private void btnLogin_Click(object sender, EventArgs e) 
{ 
    Form1 frm = new Form1(); 
    string sql = "SELECT * From Admin WHERE UserName='" + txtUserName.Text + "' And Password='"+txtPassword.Text+"'"; 

    if (conn2.State != ConnectionState.Open) 
    { 
    conn2.Open(); 
    } 

    command = new SqlCommand(sql, conn2); 
    SqlDataReader reader = command.ExecuteReader(); 
    reader.Read(); 

    if (reader.HasRows) 
    { 
    if(reader[0]==txtUserName.Text && reader[1]==txtPassword.Text) 
    { 
     // I want the code in this section 
    } 
    } 
} 

我想在登錄成功時激活「編輯標籤頁」。 「編輯頁面」是其他形式。

Answer 1

這可能對你有用。

int indexyouwant = 1; // Suppose 1 is your Edit Page Tab. 
Form1 frm = new Form1(); 
// SQL 
if (reader.HasRows) 
{ 
    if(reader[0]==txtUserName.Text && reader[1]==txtPassword.Text) 
    { 
     frm.YourTabControlName.SelectedIndex = indexyouwant; 
    } 
} 

建議您應使用參數化查詢來防止SQL Injection。