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POError Using the generic type 'System.Collections.Generic.List' requires '1' type arguments
 

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  1. POError Using the generic type 'System.Collections.Generic.List' requires '1' type arguments
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    <p>I hvae created a code in C# but I had this error :</p> <blockquote> <p>Error 1 Using the generic type 'System.Collections.Generic.List' requires '1' type arguments C:\Users\Abdelhakim\Desktop\Wind Applic C#\Exercice4\Exercice4\Form1.cs 9 34 Exercice4</p> </blockquote> <p>and this is the code I wrote :</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Collections.Generic.List; namespace Exercice4 { public partial class Form1 : Form { List&lt;string&gt; ls = new List&lt;string&gt;(); string p; public Form1() { InitializeComponent(); } private void label2_Click(object sender, EventArgs e) { } private void r1_CheckedChanged(object sender, EventArgs e) { p = "+"; l3.Text = (Convert.ToDouble(t1.Text) + Convert.ToDouble(t2.Text)).ToString(); } private void r2_CheckedChanged(object sender, EventArgs e) { p = "-"; l3.Text = (Convert.ToDouble(t1.Text) - Convert.ToDouble(t2.Text)).ToString(); } private void r3_CheckedChanged(object sender, EventArgs e) { p = "*"; l3.Text = (Convert.ToDouble(t1.Text) * Convert.ToDouble(t2.Text)).ToString(); } private void r4_CheckedChanged(object sender, EventArgs e) { p = "/"; if (Convert.ToDouble(t2.Text) == 0) l3.Text = "Erreur"; else l3.Text = (Convert.ToDouble(t1.Text) / Convert.ToDouble(t2.Text)).ToString(); } private void button1_Click(object sender, EventArgs e) { int i; for (i = 0; i &lt; ls.Count; i++) ls.Items.Add(ls[i]); } private void button2_Click(object sender, EventArgs e) { ls.Add(t1.Text + p + t2.Text + " =" + l3.Text); } } } </code></pre>
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USviggity
    1. USAimad MAJDOU
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. CO`ls.Items.Add(ls[i]);` ? what are you trying to do exactly ?
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      1. POError Using the generic type 'System.Collections.Generic.List' requires '1' type arguments
      1. USManoj Purohit
 

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