/C#/How to solve error in ExecuteNonQuery() in asp.net

How to solve error in ExecuteNonQuery() in asp.net

SqlConnection con = new SqlConnection();
con.ConnectionString = @"Data Source = (LocalDB)\MSSQLLocalDB; AttachDbFilename = C:\Users\Harry\Documents\Visual Studio 2015\WebSites\WebSite2\App_Data\Database.mdf; Integrated Security = True";
con.Open();

// insert command 
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandText="INSERT INTO firsttb VALUES ( @n , @p ) ";
cmd.CommandType = System.Data.CommandType.Text;
cmd.Parameters.AddWithValue("@n",TextBox1.Text);
cmd.Parameters.AddWithValue("@p", TextBox2.Text);

cmd.ExecuteNonQuery();

con.Close();

Source: stackoverflow.com

Similar codes

-1 vote203 views1 answer
Build a project from dotnet using cli
C#
0 vote152 views1 answer
C# clamp
C#
1 vote302 views1 answer
'Camera' does not contain a definition for 'main'
C#
1 vote226 views1 answer
C# 1 minute delay
C#
3 votes228 views1 answer
Rigidbody2d unfreeze position
C#
0 vote229 views1 answer
Unity2d switch camera
C#Unity
0 vote219 views4 answers
How to integrate a c# and angular 9
C#
5 votes200 views2 answers
C# remove first three characters from string
C#
1 vote218 views1 answer
C# edit element in list
C#
1 vote212 views1 answer
Vb.net open file with default program
C#