In my code variable i is not increamenting second time.

here in button_3 click variable i is increamenting only once.then it enters the loop but i is not increamenting.i again takes the value 0. 

 

 

 

 

 

 

 

 

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Web.Configuration;

using System.Data.SqlClient;

using System.Drawing.Design;

using System.Xml.Linq;

using System.Linq;

using System.IO;

using System.Windows.Forms;

using System.Collections.Generic;

public partial class DeptMarks : System.Web.UI.Page

{

SqlConnection con = new SqlConnection(WebConfigurationManager.ConnectionStrings["ApplicationServices"].ConnectionString);

SqlCommand cmd = new SqlCommand();

SqlDataReader dr,dr1;

DataSet ds;

DataTable dt;

BindingSource bs = new BindingSource();

int i;

int count;

int j=1;

public void Page_Load(object sender, EventArgs e)

{

ds = new DataSet();

con.Open();

cmd.Connection = con;

dt = new DataTable();

TextBox79.Visible = false;

cmd.CommandText = "select [USN] from Course_reg where Semester='" + TextBox1.Text + "' and Year='" + TextBox80.Text + "'";

SqlDataAdapter da = new SqlDataAdapter(cmd);

}

protected void Button2_Click(object sender, EventArgs e)

{

SqlDataAdapter da = new SqlDataAdapter(cmd);

// DataSet ds = new DataSet();

da.Fill(ds);

GridView1.DataSource = ds;

GridView1.DataBind();

GridView1.Visible = false;

GridView1.DataSource = ds.Tables["Course_reg"];

if (ds.Tables[0].Rows.Count > 0)

{

i = 0;

MessageBox.Show("i3" + i);

TextBox2.Text = ds.Tables[0].Rows[i]["USN"].ToString();

}

}

protected void Button3_Click(object sender, EventArgs e)

{

SqlDataAdapter da = new SqlDataAdapter(cmd);

// DataSet ds = new DataSet();

da.Fill(ds);

GridView1.DataSource = ds;

// bs.DataSource = ds.Tables["Course_reg"];

count = GridView1.Rows.Count;

MessageBox.Show("gg"+count);

GridView1.DataBind();

GridView1.Visible = false;

GridView1.DataSource = ds.Tables["Course_reg"];

if (!string.IsNullOrEmpty(TextBox44.Text))

{

string user1 = Session["user1"].ToString();

TextBox79.Text = user1;

cmd.CommandText = "select * FROM Subject where Sub_Code='" + TextBox44.Text + "' and Semester='" + TextBox1.Text + "'";

string subcode = (string)cmd.ExecuteScalar();

if (!string.IsNullOrEmpty(subcode))

{

if (DropDownList2.Text == "CAT-1")

{

int m1 = Convert.ToInt32(TextBox41.Text);

if (m1 >= 0 && m1 <= 20)

{

cmd.CommandText = "INSERT INTO Student_marks VALUES('" + TextBox1.Text +

"','" + TextBox80.Text +

"','" + TextBox2.Text +

"','" + TextBox44.Text +

"','" + TextBox41.Text +

"','" + "','" + "','" + "','" + "','" + TextBox79.Text + "')";

cmd.ExecuteNonQuery();

}

else

{

Label2.Text = "Marks should be in the range of 0-20";

Label2.Visible = true;

}

}

if (DropDownList2.Text == "CAT-2")

{

int m2 = Convert.ToInt16(TextBox41.Text);

if (m2 >= 0 && m2 <= 20)

{

cmd.CommandText = "update Student_marks set CAT_2='" + TextBox41.Text + "' where USN='" + TextBox2.Text + "'and Semester='" + TextBox1.Text + "' and Subject_code='" + TextBox44.Text + "'";

cmd.ExecuteNonQuery();

}

else

{

Label2.Text = "Marks should be in the range of 0-20";

Label2.Visible = true;

}

}

if (DropDownList2.Text == "Makeup")

{

int m3 = Convert.ToInt16(TextBox41.Text);

if (m3 >= 0 && m3 <= 20)

{

cmd.CommandText = "update Student_marks set CAT_3='" + TextBox41.Text + "' where USN='" + TextBox2.Text + "'and Semester='" + TextBox1.Text + "' and Subject_code='" + TextBox44.Text + "'";

cmd.ExecuteNonQuery();

}

else

{

Label2.Text = "Marks should be in the range of 0-20";

Label2.Visible = true;

}

}

if (DropDownList2.Text == "CAM")

{

int m4 = Convert.ToInt16(TextBox41.Text);

if (m4 >= 0 && m4 <= 10)

{

cmd.CommandText = "update Student_marks set CAM='" + TextBox41.Text + "' where USN='" + TextBox2.Text + "'and Semester='" + TextBox1.Text + "' and Subject_code='" + TextBox44.Text + "'";

cmd.ExecuteNonQuery();

}

else

{

Label2.Text = "Marks should be in the range of 0-10";

Label2.Visible = true;

}

}

if (DropDownList2.Text == "ESE")

{

Int32 mr1, mr2, mr3, mr4, mr5, b1 = 0, b2 = 0, cat = 0, ese = 0, total = 0;

int m5 = Convert.ToInt16(TextBox41.Text);

if (m5 >= 0 && m5 <= 100)

{

cmd.CommandText = "update Student_marks set ESE='" + TextBox41.Text + "' where USN='" + TextBox2.Text + "'and Semester='" + TextBox1.Text + "' and Subject_code='" + TextBox44.Text + "'";

cmd.ExecuteNonQuery();

}

else

{

Label2.Text = "Marks should be in the range of 0-100";

Label2.Visible = true;

}

cmd.CommandText = "select * from Student_marks where usn='" + TextBox2.Text + "'";

dr = cmd.ExecuteReader();

dr.Read();

mr1 = int.Parse(dr[4].ToString());

mr2 = int.Parse(dr[5].ToString());

mr3 = int.Parse(dr[6].ToString());

mr4 = int.Parse(dr[7].ToString());

mr5 = int.Parse(dr[8].ToString());

if (mr1 <= mr2 && mr1 <= mr3)

{

b1 = mr2;

b2 = mr3;

}

else if (mr2 <= mr1 && mr2 <= mr3)

{

b1 = mr1;

b2 = mr3;

}

else if (mr3 <= mr1 && mr3 <= mr2)

{

b1 = mr1;

b2 = mr2;

}

cat = b1 + b2 + mr4;

TextBox81.Text = cat.ToString();

ese = (mr5 / 2);

TextBox82.Text = ese.ToString();

total = cat + ese;

TextBox83.Text = total.ToString();

cmd.CommandText = "insert into Final_marks values ('" + TextBox2.Text + "','" + TextBox1.Text + "','" + TextBox44.Text + "','" + TextBox81.Text + "','" + TextBox82.Text + "','" + TextBox83.Text + "','" + "')";

dr.Close();

cmd.ExecuteNonQuery();

// MessageBox.Show("hui");

//cmd.CommandText = "select * from Student_marks where usn='" + TextBox2.Text + "'";

//dr = cmd.ExecuteReader();

}

}

else

{

Label1.Text = "This subject is not registered for this semester";

Label1.Visible = true;

}

}

if (i < count)

{

i++;

TextBox2.Text = ds.Tables[0].Rows[i]["USN"].ToString();

}

if (i == count)

{

Label1.Text = "this is the last record";

Label1.Visible = true;

}

}

}