Text not getting inserted into table, but only auto incrementing other column - asp.net

Question

I have multiple textboxes that goes into a table called dbo.skills
dbo.Skills SkillID (PK- AutoIncrement) | SkillName
So when I used this method, the name is not getting stored but only SkillID is getting auto-incremented. Here is my .cs code
public void InsertSkillInfo()
{
String KKStech = #"Data Source=USER-PC\SQLEXPRESS;Initial Catalog=KKSTech;Integrated Security=True";
SqlConnection conn = new SqlConnection(KKStech);
try
{
for (int i = 1; i <= 4; i++)
{
conn.Open();
//string skill = (TextBox)((Page.FindControl("TextBox" + i.ToString()))).Text;
var skill = "";
var control = Page.FindControl("TextBox" + i.ToString()) as TextBox;
if (control != null)
{
skill = control.Text;
}
const string sqlStatement = "INSERT INTO Skills (SkillName) VALUES (#SkillName)";
SqlCommand cmd = new SqlCommand(sqlStatement, conn);
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("#SkillName", skill);
cmd.ExecuteNonQuery();
conn.Close();
}
}
catch (System.Data.SqlClient.SqlException ex)
{
string msg = "Insert Error:";
msg += ex.Message;
throw new Exception(msg);
}
After entering values in textboxes, table looks like this-
Dbo.Skills
SkillID | SkillName
1 |
2 |
3 |
4 |
ASPX code:
<asp:Label ID="Label1" class="caption" runat="server" Text="Skill Name"></asp:Label>
<asp:TextBox ID="TextBox1" class="box" runat="server"></asp:TextBox> <br /> <br />
<asp:Label ID="Label2" class="caption" runat="server" Text="Skill Name"></asp:Label>
<asp:TextBox ID="TextBox2" class="box" runat="server"></asp:TextBox> <br /> <br />
<asp:Label ID="Label3" class="caption" runat="server" Text="Skill Name"></asp:Label>
<asp:TextBox ID="TextBox3" class="box" runat="server"></asp:TextBox> <br /> <br />
<asp:Button ID="Button1" class="box" runat="server" Text="Insert"
onclick="Button1_Click" /> <br /><br /><br />